If it was just BTC then there is an argument to make, although there have been many criminal actions involving the manipulation of BTC in the past and also the use of BTC for criminal actions but that's a dumb argument because BTC makes it easier to track funds to their source, the problem arrives when you talk about cryptocurrencies as a whole and especially NFT Crypto. Then, yeah, fake money for criminals 100%. Even the IBM backed crypto was shady AF.