I had spammers uploading torrents in mass for a good while. With auto approval of torrents I spent a lot of time logging in to fight them.

Eventually I found an addon to help bulk remove torrents, but even that was a hassle. Eventually in the later years I turned on email verification, which didn't actually work (I never bothered to figure out why) and if someone really wanted to upload, they would post on the forum to which I would then manually verify them.