The forum doesn't moderate scams and will certainly not ban Yobit (or Livecoin) from advertising here due to being scam exchanges. The first Yobit campaign was banned not because the exchange is a scam but because it filled the forum with spam. We can either let them do it again and hope that theymos will bother to blacklist this new sig, or try to control it with tools available to us (mod reports, and reporting to yahoo62278).
I would prefer the campaign to not exist but that doesn't appear to be a viable scenario. Let's say the URL gets blacklisted - there is nothing stopping them from coming back with a dummy domain redirect or a URL shortener. They have already shown that they can run the campaign completely off site if they wanted to, and that there is no lack of suckers wanting to earn $1-2 per post. Having a quality control person (which is what yahoo62278 essentially does, not really "managing" it) is better than not having one.
Tagging users for wearing a signature pointing to a forum is too much IMO. It doesn't even link to the actual exchange.
I agree that it is better to do something than to let spam storm to happen again, although from what I see on the forum the situation is not good at all, pointless and poor quality posts are everywhere, which stems from the fact that the applications are completely uncontrolled - is it even possible to control hundreds of people in one campaign?
It is true that link from sig does not lead directly to YoBit, but to be paid user must register to that exchange which is more than obvious promotion of YoBit, and it is fun to see that exchange board is listed as second board from the top on that forum and that YoBit is have thread with most comments, coincidence or not everyone can judge for themselves...
What I see as a problem in this story is that the bad product is packed in new packaging, and it has hired a manager who has a reputation. Although I am aware that the forum is not moderate scams, on the moral side, it is wrong to help them in any way.