I think your forgting still the fact that said abusers cluster together.

All that would be needed is for one person to have their cluster buddy's send a few tells the victim takes the bait because their reall names not omgsell.booooo sends a tell in return then boom they have been the target of this system of yours and are locked out from doing stuff.

I'll admit your ideas are good in theory its too flawed to the point it be used to harm legit players. Wer don't live in a perfect world where we can trust people to use stuff like this as intended they will find away to twist it to make it fun for them by ruining another's time.