You can report a spammers or a plagiarist to moderators. Ratimov was reported but not banned. His old articles were reported but not be seen a plagiarism to moderators.
I don't think I ever looked into whatever allegations of plagiarism Ratimov had against him, but I trust the judgement of the moderators; if Ratimov was guilty, I seriously doubt they'd make an exception for him. Enforcement of the rules--and especially the one for using other people's words without citing a source--is pretty damn harsh here, and I don't think I've seen much favoritism as far as letting certain members get away with something. I was surprised when Bruno got temp-banned a while back for consecutive posting, but he did.
Perhaps not the best attitude, but if they do turn out to be a useful member it's simple to remove the ~
Gee, why is my gut telling me that isn't going to happen?