When I finally get a desktop computer and internet access from home, I'm going to start tagging account farmers/shitposters in earnest. And in my mind there's little doubt who's doing it. It's like pornography. It's hard to define exactly, but you know it when you see it.
This is for now second best strategy right after banning them, but it will keep working only as long as tagged accounts remain banned from entering campaigns. If you tag enough of them some managers will surely set new rules that will allow tagged accounts post with reduced rates. Business is business.
I was lurking in 2014-2015 before I created this account and it was pretty damn bad then. Lately it's gotten a hellova lot worse, though. Sig campaigns have turned into lucrative money-making ventures for the Philippines and other poor, undereducated (not just in English, either) countries and they've attracted people in those countries by the thousands. It's great for them but horrible for the forum.
It's not just a lucrative business for the poor, it's a gold mine. Some of you rich boys should realize that in those countries you're earning 20$ a day in a job, working your ass of in construction, docks, or driving a cab. Recently, when Bitcoin was closing to $20,000, campaigns were paying over 10$ for a post! One day spent on a forum can feed a family for a month in Pakistan, India, or Bangladesh . This is a life changing deal for those people and they will keep swarming here like locust trying to copy-paste and google translate until something is done.