An urban myth is that crypto is a tool for money laundering.
Crypto is transparent but anonymous, you can see what the person is doing but not who they are. However, this does not mean that there is an illegal situation here. Because centralized exchanges require identity verification in order to use their accounts. If there is surveillance by the state within such a transaction, this person can be learned by the state in central systems. Centralized and decentralized exchanges can also be divided in this way.
In cases that resonated as deepweb and illegal money transactions, these centralized exchanges were not yet used. Before centralized exchanges, crypto purchases were made by transferring money from different bank accounts to the coin owner. It is possible that illegal situations may exist or have occurred during this unsafe method.
Currently, commercial transactions in exchange for coins can only be made through the stock exchange, so this and similar situations have been prevented.