Oh USA law is so fucked up complex , layered and contradictory it is amazing.

And theymos lives in USA (maybe) the forum is USA based (true) and like it or not he simply does not want the hassle for the forum from the Gov.

So asking theymos to do mixers would likely mean asking him to relocate to a far more liberal tax country. Just to run the forum. That may not be realistic at all for him.