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:
Yes, I am referring to yahoo
62278. I think you are arguing semantics, if he has the power to remove someone from the campaign, he has the defacto ability to accept someone because he could remove someone immediately who he does not want to accept. I have also noticed that he does not handle payments on most signature campaigns he runs, the payments are rather handled, and credited on the website platform of the company that is paying for the advertising.
Nevertheless, he is associating his reputation with YoBit, which is not beneficial to him. YoBit has a history of conducting business unethically, and anyone helping YoBit run its business, including helping with a signature campaign is furthering these unethical business practices, even if not directly participating in the unethical behavior personally.