Not sure how many people are willing to tag spammers, given that:
That's partially why I sped up work on merit. I don't agree with using the trust system for pure spam; that's not what it was designed for.
I don't think anybody on DT is actively doing so after the merit system was rolled out, so I'm not sure exactly what OP is expecting here. If anyone is concerned about shitposting, they need to report those posts. Mods have a pretty good track record of deleting shitposts and at least temp-banning the offenders.
I used to tag shitposters, as did actmyname, but the trust system is a really bad way to deal with them. It's a misuse of it, but at the time the problem was so out of hand that there wasn't anything else to do and something had to be done. That isn't the case today, because of merits. So this thread should probably be locked and OP would be better off just reporting shitposts. As always, I applaud anyone who takes up the fight against these people.