This thread does not belong in the Bitcoin Discussion. It should be either in service discussion or in meta or reputation. Service discussion is the best section to discuss any specific service. In this case, it's mixers!
Considering that mixers and casinos seem to be the biggest advertisers here, I foresee a drop in revenue for the forum. What do you think?
Forum admins or the forum does not make money from these campaigns. It's the forum members who make some money from their signature campaign. Some members may leave the forum, some others may become less active. But the forum will remain the same.