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Generally, it depends on managers to set up rules for their campaigns and criteria to count eligible posts and it is a complex combination of many factors
I agree with this one. Signature campaigns provide a good way for members to generate some income, and to help support a community. It's easy to look at them as a bad thing, but they really can be both negative and positive. Managing campaigns can be time-consuming, especially if you are running multiple campaigns. This is not always a problem, but when hundreds of members signup on an campaign, it is a challenge for the manager to sort out who is posting quality content, who is posting low quality content, and who is a regular spammer. However, it really is up to them to set the standards for engagement that they expect from their participants. And it is up to us to report spam and low quality content to the moderators and thus help keep the forum clean.
I suggest that there should be a minimum level to show the signature in all forums, such as 1 merit per month or 20 per month in some spam boards, if you do not get those merits, the signature will disappear.
It's an interesting idea. The question is, how do we determine how many merits someone needs to get before a signature appears?