Mixing has to stay ahead of enforcement and this encourages even more advanced mixing.
However, casinos have legal regulations that they have to follow and thus can function. For governments, not knowing who is using the mixer because they have no control over it is already a money-laundering suspicion. It doesn't have to be a criminal, but they just need to know who it is and this can be an excuse to close the mixers. Possibly, they will create similar legal regulations as casinos have and then mixers continue to work.
Then the government has to regulate mixers,,, and make it the law to do so. If they want, they can try. You have to prove a crime first before you can call it a crime. We all know the state can make up any excuse it wishes to do what it wants.
On the pretext of protecting people. But taking away our right to privacy is the most sinister crime governments are not held responsible for.