I know that scam are not moderated and most of those participant have been red tagged.
If I'm not mistaken, some previous yobit signature campaign participant should also be banned from displaying signature just because yobit is a scam exchange. Meanwhile, both site have been proven to be scam, so I think it's a good idea for the admin to take the same action as the yobit participant.
Well, your suggestion has been brought up multiple times but the final answer has always been
que sera, sera (whatever will be, will be):
Forum doesn't moderate scams. Its up to each individual to determine if a person is going to scam or not. The forum doesn't act as a judge,jury or executioner.
In other words, you have to do your own research or you pay for your carelessness.