Very interesting subject..
I have been interested in the subject of shills, fudders, sliders, glowbaiters, etc. for quite a while and I could see motive to sow discord around here and possibly also infiltrate positions of influence..

I'll read the rest of the linked article in the OP later and maybe add some interesting information I have come across on these tactics of such shill groups as shareblue and "russian bots"..

Their was a recent case of an agent being outed posting bait on 4chan, as nutildah mentioned, by releasing a report with screenshots of "you" in the ID of posts iirc..
It does happen and they do slip occasionally..