There was a chaos in yobit.net signature campaign as far as I can remember but were they banned here? I can't remember.
Has it ever happened that due to spamming, theymos banned any signature?
I think that to ban the company or campaign, it would be necessary for the company or campaign to be the one promoting this spam situation.
Fortunately, I think all campaigns have promoted contrary ideas. Except for those campaigns that want to see posts in gaming and gambling locations. However, this is another level of the issue, which is not generalized throughout the forum, and is concentrated in a specific place in the forum, prepared for this purpose.
Therefore, if things do not change much from what has been happening, it is not something that will happen.