Billion-dollar Crypto Scams and How to Avoid Them

From billion-dollar Ponzi schemes to devastating rug pulls, the crypto world is full of cautionary tales. These real-life incidents highlight the risks – and why Crypto Corner is here to keep remind you what you are up against and how to spot potential scams, so you can navigate your crypto journey safely.
In this article I outline the main things to watch out for, so you can spot a fake before it’s too late.

Here is a chronological look at some of the biggest scams, fraud schemes, and exchange collapses in crypto history:

Mt. Gox (850,000 BTC Mismanagement & Collapse) – 2014
Handling over 70% of global Bitcoin transactions at its peak, Mt. Gox suffered from catastrophic internal mismanagement, unencrypted keys, lack of accounting controls, and internal trading bots (such as the “Willy Bot”) that artificially inflated volume.
Because staff misinterpreted leaking funds as routine wallet transfers, over 850,000 BTC vanished over several years before the platform abruptly shut down and filed for bankruptcy.
Impact: A historic turning point that exposed the severe dangers of unmonitored centralized exchanges and poor custody practices.
OneCoin ($4B Ponzi Scheme) – 2014-2018
Marketed as the “Bitcoin killer,” OneCoin claimed to feature a revolutionary blockchain and promised guaranteed high returns. In reality, there was no blockchain or transparency at all. It targeted investors worldwide using aggressive marketing and multi-level marketing structures. Ruja Ignatova, known as the “Cryptoqueen,” vanished in 2017 to evade law enforcement, leaving behind over 3 million victims globally.
Impact: One of the largest financial frauds in history, severely eroding public trust in cryptocurrency.
Lesson: While Onekey was being aggressively promoted by mlm marketers, there were reports about it being a scam since 2014, its own Wikipedia page claimed it’s a fake coin, but many people turned a blind eye to those warnings. Next time you see reports about a project sending you a warning, do not ignore it.
Bitconnect ($3.4B Ponzi Scheme) – 2016–2017
Bitconnect promised returns of up to 40% per month, claiming an automated trading bot generated the profits. In reality, payouts to early investors came directly from incoming capital from new participants. The scheme collapsed in early 2018, resulting in massive losses for thousands of people.
Impact: Heavily damaged the credibility of legitimate crypto projects and triggered strict regulatory scrutiny.
HashOcean (100,000+ BTC Cloud Mining Scam) – 2016
Operating as one of the largest cloud-mining platforms, HashOcean promised daily payouts from supposed Bitcoin mining hardware. Community tracking estimated HashOcean accumulated around 110,000 BTC before the site vanished overnight in June 2016, locking out an estimated 700,000 registered users worldwide. Users reported that HashOcean was receiving around 2,200 BTC per day in new deposits right before shutting down their domain.
Impact: Exposed the rampant fraud in early cloud-mining platforms and taught investors to demand physical proof of mining operations.
DasCoin / NetLeaders (Fake Crypto Ponzi) – 2016-2017
Marketed through NetLeaders, DasCoin pitched itself as an exclusive “consortium blockchain” and digital currency ecosystem. Built on an MLM structure similar to OneCoin, it enticed investors with licenses to acquire coins before publicly trading. The scheme stalled for years before quietly executing a reboot attempt and collapsing in 2019.
Impact: Illustrated how multi-level marketing schemes use internal “closed ecosystem” tokens to hide zero real-world value.
Centra Tech ($25M Celebrity-Backed ICO Fraud) – 2017
Centra Tech raised millions during the 2017 ICO craze by claiming to offer a crypto debit card backed by Visa and Mastercard. The team forged fake corporate partnerships, invented fictional executive profiles, and hired high-profile celebrities to promote it. The SEC later shut down the project, and the founders were sentenced to prison.
Impact: Exposed how fake celebrity endorsements and fabricated partnerships were used to mislead retail investors.
USI-Tech ($150M Trading & Mining Scam) – 2017
Originally a foreign exchange trading company, USI-Tech shifted to crypto in 2017 by offering packages promising 1% daily returns from automated Bitcoin trading and cloud mining. When regulators issued cease-and-desist warnings in early 2018, the platform froze withdrawals and fled with over 1,774 BTC and 28,589 ETH from user deposits. Its founder Horst Jicha was arrested by the FBI in late 2023. While out on house arrest in late 2024, he tampered with his electronic ankle monitor and fled law enforcement, leaving the stolen stash missing.
Impact: Pushed regulatory authorities worldwide to crack down on multi-level marketing platforms promising fixed daily returns.
PlusToken ($2B Ponzi Scheme) – 2018
Promoted as an investment wallet, PlusToken enticed users with ridiculously high payouts from supposed “crypto arbitrage.” In 2019, the operators executed an exit scam and disappeared with over $2 billion in user deposits. It was one of the most popular mlm token wallets (a fake scheme that was only obvious to those who already had some idea how crypto works, but managed to fool anyone who was new to crypto).
Impact: Left millions of victims, primarily across Asia, with devastating financial losses.
FutureNet / FutureCoin ($21M Pyramid & Crypto Scam) – 2018
Posing as a “social media platform” combined with ad-package revenue sharing, FutureNet later launched its own token, FutureCoin. It promised high daily payouts to users who bought membership tiers and recruited new members. Regulators across multiple countries flagged it as a pyramid scheme, and its co-founders were later arrested internationally.
Impact: Highlighted how fraudulent platforms use social media hype and ad-sharing gimmicks to disguise multi-level pyramid schemes.
Mirror Trading International / MTI ($1.2B Bitcoin Ponzi Scheme) – 2019
Operating out of South Africa, MTI claimed to use an advanced AI-powered trading bot to generate guaranteed, high-yield passive income. In reality, no trading took place, and payouts relied entirely on funds from new victims recruited through multi-level marketing. In late 2020, the CEO vanished with over 23,000 Bitcoin.
Impact: One of the largest multi-level marketing Ponzi collapses in Southern Hemisphere history.
Thodex ($2B Exchange Exit Scam) – 2021
Thodex, a major Turkish crypto exchange, ran flashy promotions offering luxury cars to attract new deposits. In early 2021, the platform suddenly suspended withdrawals citing technical issues. Shortly after, the CEO fled the country with $2 billion in user funds, affecting everyone from retail investors to large traders.
Impact: Exposed the severe lack of regulatory oversight and accountability among centralized exchanges.
Africrypt ($3.6B Exit Scam) – 2021
Founded by two teenage brothers in South Africa, Africrypt claimed to yield massive returns through crypto trading. In mid-2021, the founders claimed the platform was hacked and urged clients not to involve law enforcement. Shortly after, the brothers vanished along with billions in client Bitcoin.
Impact: Unveiled glaring regulatory gaps in emerging markets and led to calls for strict exchange licensing.
CryptoZoo ($7.7M NFT Fraud) – 2021
Heavily promoted by prominent influencers, CryptoZoo was pitched as an interactive play-to-earn NFT game where players could breed and trade digital animals. The playable game was never delivered, and team members walked away with millions, leaving holders with worthless assets.
Impact: Highlighted the severe risks of influencer-backed projects that lack accountability and real development teams.
SaveTheKids Token ($Multi-Million Rug Pull) – 2021
Promoted as a charity token by popular online influencers, SaveTheKids promised to send transaction fee proceeds to children’s charities. Within days of its June 2021 launch, key insiders dumped their token allocations, crashing the price and leaving supporters with worthless tokens.
Impact: Severely damaged public confidence in charity-focused crypto tokens and social media endorsements.
Squid Game Coin ($3.3M Rug Pull) – 2021
Capitalizing on the hype surrounding Netflix’s “Squid Game,” developers created a token in late 2021 that rapidly skyrocketed in price while restricting user withdrawals. Lured by the promise of a play-to-earn game, investors jumped in. Once the price peaked, the developers pulled the liquidity pool and vanished.
Impact: A classic pump-and-dump scheme that preyed on popular cultural trends and investor FOMO (Fear of Missing Out).
Frosties ($1.1M NFT Rug Pull) – 2022
In early 2022, the creators of the Frosties NFT collection promised holders staking rewards, raffles, and access to a metaverse game. As soon as the tokens sold out, the creators deleted their community channels and transferred the funds out. U.S. federal authorities later tracked down and arrested the founders.
Impact: A landmark criminal case that proved federal law enforcement could track down anonymous NFT rug pull operators.
Terra/LUNA Collapse ($60B Market Crash) – 2022
Terra’s algorithmic stablecoin (UST) and its sister token (LUNA) were designed to maintain a 1:1 dollar peg using a mint-and-burn mechanism. In May 2022, market pressure broke the UST peg, triggering a death spiral that wiped out $60 billion in market value within days and destroyed investor portfolios worldwide.
Impact: Triggered industry-wide contagion and severe panic across both retail and institutional markets.
Three Arrows Capital / 3AC ($3.5B Leverage Implosion) – 2022
3AC was one of the world’s premier crypto hedge funds, managing billions. The fund operated with massive, unhedged leverage across multiple centralized lenders and protocols. When LUNA collapsed and market prices dropped in mid-2022, 3AC suffered massive margin calls that it could not satisfy. Instead of managing risk, the founders ghosted creditors, leaving a $3.5 billion hole that triggered a cascading insolvency wave across the market.
Impact: Showcased the extreme systemic risk of hyper-leveraged, unmonitored hedge funds borrowing unsecured capital across multiple lenders.
Celsius Network ($1.2B Deficit & Mismanagement Collapse) – 2022
Pitched under the slogan “Unbank Yourself,” Celsius promised high double-digit yields on crypto deposits. Behind the scenes, executive management took extreme, unhedged risks with user deposits, deployed funds into illiquid protocols, and actively manipulated the price of their native token (CEL) to mask severe balance-sheet deficits. In June 2022, Celsius froze all user withdrawals before declaring bankruptcy. CEO Alex Mashinsky was later indicted and convicted of federal fraud.
Impact: Destroyed the retail “crypto lending/yield” model and proved that high yield often hid opaque, institutional-level gambles.
FTX Collapse ($8B Fraud) – 2022
Once the second-largest crypto exchange in the world, FTX collapsed in late 2022. Investigations revealed that customer deposits were secretly funneled to its sister trading firm, Alameda Research, to cover risky investments and liabilities. The resulting liquidity shortfall wiped out $8 billion in user assets and caused a heavy drop in Bitcoin’s market value at a time when it was completing a bear cycle. This marked a cycle bottom back in Nov 2022 and millions of users lost their funds on the platform.
Impact: Sent shockwaves through the entire crypto market, prompting urgent global calls for institutional regulation and proof-of-reserves.
BlockFi ($1B+ Contagion Bankruptcy) – 2022
BlockFi was a high-profile retail lending platform that allowed users to earn interest on holdings and borrow against crypto. Despite maintaining a polished corporate image, BlockFi suffered severe management missteps, including huge over-exposure to Three Arrows Capital and a massive, unhedged credit facility tied to FTX. When FTX collapsed, BlockFi’s capital pipeline vanished overnight, forcing them to freeze user funds in November 2022 and file for Chapter 11 bankruptcy
Impact: Highlighted how counterparty contagion can destroy customer assets even at regulated, corporate-backed platforms.
JPEX Exchange Fraud ($200M Collapse) – 2023
JPEX, a Dubai-based exchange heavily marketed in Hong Kong, used celebrity endorsements and aggressive advertising to promise yields up to 20%. In late 2023, regulators warned that JPEX was unlicensed, leading the exchange to freeze withdrawals by hiking transaction fees to 999 USDT. Authorities subsequently arrested several executives and promoters.
Impact: Marked one of Hong Kong’s largest financial fraud cases, triggering strict regional registration rules for exchanges.
Malone Lam Social Engineering Heist ($230M Fraud) – 2024
In late 2024, a cybercriminal group led by Malone Lam targeted a high-net-worth investor through sophisticated social engineering. Impersonating Google and Gemini support staff, they tricked the victim into sharing their screen, exposing their seed phrase and draining over 4,100 Bitcoin ($230 million). Federal authorities tracked down the group after they shared videos of their lavish spending on social media.
Impact: Highlighted how high-net-worth individual target attacks had evolved past simple code exploits to psychological social engineering.
AI-Enabled Deepfake Fraud Syndicates ($17B Stolen) – 2025
Throughout 2025, transnational fraud rings industrialized crypto scams using generative AI, face-swapping deepfakes, and automated LLM chatbots. Scammers mimicked trusted figures, executives, and romantic partners to coerce victims into depositing funds into fraudulent crypto trading portals.
Impact: AI integration supercharged scam efficiency, allowing fraudulent operations to extract over four times more revenue per attack than traditional manual scams.

All of these entries are teaching us an important lesson: surviving in the crypto arena requires a sharp eye for warning signs and structural red flags.
While legitimate projects exist, an overwhelming number of platforms are unsustainable cash-grabs designed to vanish once user deposits peak. Protecting your capital begins with identifying these core scam mechanics:

Guaranteed & Fixed ROI Promises:
Any platform or scheme promising fixed yields – whether it is 1% daily, 3% monthly, or a “risk-free” annual percentage – is running an unsustainable structure. Real cryptocurrency markets are volatile; guaranteed returns are mathematically impossible without relying on fresh investor deposits to pay out earlier ones. All mlms and network marketing schemes that operate with crypto (in any shape or form) are in fact ponzi schemes designed to steal your crypto, the best you can expect is to make some money from commissions, but you will be dragging more people into a scam, which I cannot condone. I’m speaking from personal experience too, I was fooled by many of these in the past, in my early days of making money online. It took me three years and many failed attempts until I realised that all mlms that offer any type of crypto services are in fact ponzi schemes and not one of those has lived long enough to prove me wrong. I lost around $48K in such schemes and I am writing about these to send a warning to all of you who are reading this article.
Cloud Mining:
Cloud mining operations that sell “contracts” promising fixed daily Bitcoin or altcoin payouts are almost universally fraudulent. Scammers frequently use stock images or fake facility tours to hide the fact that no actual mining hardware exists. Even in those instances where they do exist, mining difficulty rates chenge all the time and in most cases the end user sees very small returns, often taking well-over a year or two before you break even on the cost you spent, leaving you at their mercy and luck, just to cover up losses, hardly ever going in profit. You are always better off just buying Bitcoin and having profit from its market performance instead of trying to mine it with cloud service.
Managed Accounts & “Done-For-You” Traders:
Exercise extreme caution with paid private groups, social media “account managers,” or automated bots that ask you to transfer control of your funds so they can trade on your behalf. Once you deposit capital into an unverified third-party platform or wallet, you relinquish ownership, and any reported profits on their dashboards are usually fabricated numbers. I would never hand over my capital to any traders or even platforms that operate such “done-for-you” schemes, they are all designed to extract capital from users.

Ultimately, these schemes rely on artificial urgency and aggressive marketing to lure investors. When platforms inevitably shut down, users are left with zero recourse and no access to their promised returns. Maintaining self-custody, demanding transparent proof-of-reserves, and rejecting any promise of “easy passive income” remain your most effective defences in crypto.

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