There is a lot of criminals that deal with drugs and weapons, and they use cryptocurrencies, unfortunately. They find it very convenient and safe. Although a very low percentage really deals with crypto, it has become a problem. First of all, it is the problem for many honest people, who want to work with Bitcoin and altcoins, but their countries, being afraid of crimes, bans crypto.
Many of these crimes are being committed trough some of these exchanges that are well known, and I really wonder what the whole KYC they have been requesting for is all about, what exactly is the function if not for it to help such situations as this. When it comes to all these formalities, they forget decentralized system, but when it comes to taking money from scammer and fraudulent people, they make claim of anonymous system.
If we need to get it right I think there is need to purge the exchanges too because they are abetting some of these criminals in their platform also. Look at Binance that was hacked 41 million dollars, and I am sure it was moved from Binance to another CEX exchanges, but till now, they still could not trace it, so what is the work of KYC?