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?
I think solving that problem is quite easy. Several people already mentioned that Yobit should implement the usual signature campaign route: require approval before they got paid. If that's not implemented, then having thousands of members suddenly burst posting within a week is not impossible at all.
Even if Yobit was not shady, they'd attract spammers if they continue with the way it is.