As a generalisation it seems sensible that it should be illegal to knowingly handle illegal things and the proceeds of illegal things.

It’s hard to say that it’s ok to profit from someone else’s crime.

If I sell you a bike cheap, no questions asked, then you ought be as culpable as me as you don’t have reasonable doubt that it’s stolen. Etc.

This can be weaponised. The lobbies go after visa and Mastercard etc by giving the company “proof” that same transactions are very illegal, eg leaks or underage or duress etc. This forces them in the position of being complicit which means they have to step back.