Unless they use mixer which is a favorite thing to them. But yeah, I agree because most criminals prefer using fiat because banks can cover for them and they can use this dirty money to buy assets that will clean their money.
Finding a reliable cryptocurrency mixer is getting difficult nowadays. A number of them have been closed down by the authorities in the recent times. The most well known example is that of Bestmixer.io.
That's the only example of a mixer being taken down by the authorities. And it's a special case because Bestmixer advertised themselves as a money laundering service. Other mixers don't.
What's wrong with Chipmixer?
