5 biggest crypto scams of all the time. 1. BitConnect: BitConnect was a high-profile Ponzi scheme that promised investors lucrative returns through a lending and trading platform. However, it eventually collapsed, resulting in huge financial losses for investors. 2. Mt. Gox: Mt. Gox was once the largest cryptocurrency exchange, until it suffered a devastating hack in 2014. Approximately 850,000 bitcoins were stolen, leading to its bankruptcy and significant losses for users. 3. OneCoin: OneCoin was a fraudulent cryptocurrency that claimed to have its own blockchain technology but was later revealed to be a pyramid scheme. Authorities shut down the operation in 2017, and its founders were arrested and charged with fraud. 4. PlusToken: PlusToken was a Ponzi scheme that operated mainly in China and South Korea. Promising high returns, the scheme collected billions of dollars from investors before its founders vanished and the platform collapsed. Many individuals lost their investments in the process. 5. Bitpetite: Bitpetite was an investment platform that claimed to offer guaranteed returns on users' deposits. It abruptly shut down in 2017, with many investors losing their funds, highlighting the risks involved in trusting unregulated and unsustainable investment schemes. It's important to conduct thorough research and exercise caution when investing or engaging with any cryptocurrency project to avoid falling victim to scams.