I'll leave my opinion on Yobit aside, but I don't think it's a sound precedent to outright ban particular campaigns or signatures. It could have been handled on an individual basis, with spammers being banned.
This is exactly what the Signature Campaign Guidelines warn for. It's not the forum's job to look after a signature campaign, they should have hired someone to do this.Banning their signature is a punishment to YoBit, and sets an example for others. I think this is exactly what this forum needed
The question is will there be some legit campaign manager who will accept their sig campaign? Maybe most of this campaign managers will be hesitant as to whatever may happen to their service.
That's why I suggested Atriz to apply: his reputation is red already, but he is a good campaign manager.