BitConnect — A Ponzi scheme promising high returns, collected $3.5 billion (2016-2018), collapsed, leaving investors without funds.
OneCoin — MLM-style scam, raised over $4 billion since 2014. The founder disappeared, and the blockchain turned out to be fictitious.
Pincoin and iFan — A scheme from Vietnam, attracted $660 million through fake ICOs. The management vanished with the money.
Prodeum — A "produce tracker" disappeared after raising funds, leaving only the word “penis” on its site.
Centra Tech — Promised a crypto debit card, raised $25 million. The founders were convicted of fraud.
