I think the only board that is in danger was in the Bitcoin Discussion and Altcoin Discussion board
Those two sections are beyond redemption anyway and can't be shat upon any more than they are already. The Yobit participants could still make constructive posts and hit the maximum amount allowed per day by the campaign, but I'm not optimistic about that actually happening. If the shitposts stay mainly in those two sections, the damage will be somewhat contained at least. I hate that Bitcoin Discussion has become a spam section, because it should be where all the good threads get created, but whatever. Theymos is OK with it, so I won't fret.
I also expect to see a lot plagiarized post with lot of low quality post.
Me too, and I'd imagine it's going to be damn hard to catch all of them. Yobit really should tighten up their campaign standards.
Good luck with your extra-super-scientific experimenty thing, actmyname. Let me know which journal you're going to publish the results in.