This has happened in tradfi more times than anyone can count. Lehman, Enron, Madoff, etc. Far more scams in tradfi.
https://www.cnbc.com/2021/12/21/criminals-have-stolen-nearly...
The crypto market blowups pale in comparison to even dotcom era exuberance, and the recovery from bear market conditions has been much more rapid (usually less than 3 years to recover to previous levels). Crypto rebuilds quicker, and grows more resilient with every passing year.
On-chain exchanges like Uniswap can't be hacked, can't misrepresent funds or exchange rates, and are fully open source. This is the future we're working towards. Not centralized scam operations like FTX.