Even if he only created the contract the developer essentially thumbed his nose at the state. That is the kind of "crime" that government takes very seriously. If they want to screw him they will. It's just a question of how thick the veneer of legitimacy on the screwage will be. It's not like this guy has some vocal political minority to back him up so there's not much to stop them.
Building a mixing service that allows people to buy stuff without their employers being able to track it is a legitimate, non-trivial reason.
These mixers are privacy enhancers. Privacy is a general term, and doesn't have to relate to evading the government. If you don't want your employer to know you've bought an NFT from your company's direct competitor, that is a privacy request too.
