When theymos launched merit system in early of 2018, he wrote that if spamming does not decrease and such annoyance from spam permissive signature won't be controlled or at least, reduced; he would consider to disable all signature campaigns paid in altcoins or tokens;
We talked about this in Meta a few weeks ago.
The problem with altcoin signature campaigns is often in the bounty managers. They accept everyone that applies as long as they have the appropriate rank. The applicants post history isn't checked and therefore the quality of the posts is below standards.
This wouldn't happen with any of the reputable campaign managers that we have that manage Bitcoin campaigns. The solution is applying the same guidelines and standards in the altcoin section that we already have for bitcoin campaigns.