The answer is simple, NO.
how a clear boundary will be set here? what volume of scams is needed to expel someone from the forum?
Also what we will do with some previous campaigns from well-known fraudsters (Yobit for example). are we going to do it retroactively? Also probably all participants won't wear their signature if they know that he will be banned.
Correct me if I am wrong and specific signatures can easily be detected and removed.
Simple - ban signatures that link to 1xbit site(s).
it can only be if it is excessive spam. If I remember correctly Yobit's signature has been banned a long time ago. they had an automated campaign practically without restriction ideally for spammers.