If they make it illegal people will be forced to buy, sell, and transact outside of kyc services. This is why building circular economies and supporting/using services like bisq, robosats, peach, and hodlhodl is so important.

I don’t know that you can make any other txn look like a collaborative txn, BUT we can make all or most txn look like a collaborative txn. If a jurisdiction makes collaborative txns illegal then people can move to a friendlier jurisdiction. But enforcing these these types of laws is impractical at best.

In Roman’s case I don’t think they arrested him because he was using bitcoin fog to mixi his coins, but because authorities think he was laundering money.