There have been a number of other big Ponzi schemes in addition to OneCoin, the biggest crypto scheme ever. Bitconnect was exposed in 2018, ultimately crashing and causing its investors to lose $3.5 billion. PlusToken scammed investors until 2019, when it was closed down, after costing investors over $3 billion. GainBitcoin was an India-based coin that robbed investors of over $300 million before it closed down. Mining Max scammed investors out of $250 million until authorities shut it down in 2021.