The person running the signature campaign seems to have a decent amount of positive rep, and I would assume he would care about the answer to this question before associating himself with a company. I would also think YoBit themsleves would want this addressed to protect their own brand and reputation.
If you are referring to yahoo, he has made it quite clear that he is not running the campaign, choosing participants, organising payments, and so forth. He simply has the power to ban spammers from the campaign:
I am not accepting participants for this campaign. Everything is done on the yobit website, just follow the instructions above. I will however be able to ban anyone I feel is spamming, anyone with justified negative trust, or anyone breaking any of the forums rules as far as campaigns go.
Basically I am a quality checker. Yobit is still maintaining payments and all that via the website. If anyone has any questions feel free to pm me or post them in here.
In terms of YoBit protecting their reputation, I think it's been pretty clear from the get-go that they neither have a reputation nor care about building one. They were quite happy to spam the forum at length with their first campaign, despite all the negativity it caused before they were banned, and they were quite happy to return with essentially the exact same campaign a second time. Their modus operandi is to spam their banner in as many places as possible to attract naive newbies, since no one who has been around for any length of time is going to touch them.