This is not much of a problem, because you are seeding to "friends" making the whole thing non commercial and a private affair in some legislatures.

Not sure if the laws have changed but what.cd used to have a certain number of users which was capped by the number of friends some judge thought to be reasonable.

If i recall correctly that whas around 200k meaning that you could run a private tracker and in case of a bust claim to know everyone.

Back in the day i had a what.cd account and when they got busted (took them many years) nothing happened to the users. I think they shredded the servers before the cops could seize them.