We've had a lot of different issues with people coming in from public invites from OTs.
One guy came in, made 5 or 6 alts (all similar to each other, which was dumb, but convenient for us), and then proceeded to call people names, go on console war rants, and attempt to troll other people into arguing with him.
The worst was a guy who came in and started spamming Avengers spoilers, and also whispering/direct messaging people spoilers, and then eventually moving onto whispering/direct messaging people sexually suggestive messages about children. I banned him, reported him to Era admins, and reported him to Discord's actual staff/admins.
So yeah, regardless of how inefficient and/or annoying it is to not have a public infinite use invite for people in this thread to just click on, I'd prefer not to deal with public invites ever again.