[splix]

"contract" is a wrong term, that's what I always arguing, because it has nothing to do with the legal meaning of the term. Here it's a public (i.e., "deployed") code. It just exists.

Regarding "profiting", it is a good question, and that's what I don't understand in this case. To my understanding there is no direct fees in Tornado Cash. But there are Relays, which, to my understanding, allow to withdraw to a fresh address and take a small fee for that. Anyone can run a Relay, and the use is optional. I think those guys were running one of them too.

A Relay doesn't know who is who and cannot limit withdrawals of money deposited by a sanctioned entity. But as they were told that some of transactions are likely illicit, even though they don't know which particular, they knowingly profiting off it in general. That's very broad and later can be applied to anyone.

Similar can be applied to mining. In general ETH, miners do know the addresses and they do not accept transactions that include sanctioned addresses. So they are fine. But for Monero example, it's the same problem. Even though they don't know the transactions participants, they may make profits off illegal transactions.