a while ago when I was doing the Sigmarxism Discord server (don't ever run a discord server btw) we had this. People on a behavioral warning were assigned the gulag tag and could only access the gulag channel. To be honest I don't think it had that big of a positive impact it was just funny watching people impotently post their garbage into a channel noone could see.

I'm not a social scientist or anything but now I think treating people like that breeds resentment and helps create more dedicated trolls with chips on their shoulders, and the better solution is the current ban them but let them slink around on new accounts if they'd like and hope they adjust their posting, otherwise ban them again.