I don't think the main reason behind Yobit campaign's punishment lie on its spamming encouragement. It involves shady behaviors of this exchange (if not scam):
You have a valid point, but I think that biggest problem of Yobit campaign was spam. I agree that Yobit don't have good reputation. But I've been in their campaign for years and nobody haven't complained, even DT members that it's not OK to advertise Yobit on Bitcointalk. Until the day when Yobit relaunched their campaign. Then lot of members started to talk that Yobit is shady exchange and some even suggested that campaign participants should be tagged.