Some of these suggestions are similar to what the newbie jail was. Instead, of restrictions on where they can post you are limiting how many times they can post. This harms the legitimate users, and 1 post per day is incredibly low. Also, requiring a certain character count is just pointless. Some replies just require a few words. In fact, I honestly think the character requirement for signature campaigns isn't needed. A constructive post can be said, and done within a couple of words, and not necessarily 100 characters. It just invites unnecessary padding of a post.

Yeah, it should be their responsibility, and they should already have some pretty strict guidelines for the best possible users joining. However, this isn't the case because there's no actual downside of them enrolling anyone, and everyone. The person who is hiring them is happy because they are getting crazy amount of traffic because their website is being spammed across the forums, and the campaign manager is happy because they are getting paid for minimal work.

There either needs to be punishments handed out to the campaign managers as well as the the members participating in the campaign or implementation of restrictions. I'm actually more inclined to try out punishing campaign managers, and see if the quality improves.

Is banning signature campaigns not a sort of restriction in itself, though? This should be the last resort. Fundamentally, it isn't a problem that users can earn from posting. There is a problem in how this is affecting the forum, and how its currently being handled.