Blockchain keep track of everything and there is no reason that a seasoned criminal will use blockchain for financial frauds.
Liquid cash is least traceable thing ,belong to the user who hold it ,You have no idea where it was previously stationed.
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Exactly and in blockchain I would need to bribe all validators to hide my transactions with banks I just need to bribe one institution and you can freely launder your money we’ve seen this happen with many a bank happy to take on such clients and pay the fines