You're right, there are no general rules about managing a signature campaign, but the forum has guidelines for signature campaigns which can be found in the pinned topics in the Services section or you can check it here: Signature Campaign Guidelines (read this before starting or joining a campaign).

But I don't know if this is still being implemented because since that guideline was posted, only a few have actually been punished or banned for not following it. I know there are some who violate it, but like others, I just let it be to avoid any issues with the said violating account. As for me, as much as possible, I avoid arguing unless I know that I am right.