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; or even more seriously disable all signature and related industry. Fortunately, merit system works, and recently a plagiabot works, so we might still see signature campaigns. Generally, participants will have to make better quality posts, it does not equal to high quality posts. But, at least they stop or reduce copy & paste; then reduce pace of spamming.