I'd like to think that the actual issue is that the STF being so horribly understaffed means they're incapable of directly investigating every report in person (Which is the easiest way to ID bots due to their erratic behavior), meaning they instead rely on flawed, automated methods of detection that only catch the most blatant of offenders.

That said, I don't see why they couldn't just broaden what behavior the GMs are capable of acting on. Literally all it would take to get rid of most bots would be to simply contact the suspect individual and ban them if they refuse to respond after several attempts.