User blog comment:ThatGenericName/What is allowed and what is not./@comment-11135771-20141112183926/@comment-11135771-20141113171135

Banning can work if you use an IP ban, or at least work better. And in any case, if they keep coming back, just keep banning them. Make a zero tolerance policy for ban evasion: if you try to get around a ban, every account you make will be permabanned the moment it gets created.