I just got permanently banned from Reddit for literally nothing. No vitriolic comments. Nothing was modded. I have no other accounts.
The only thing I can think of is that I use a VPN. That’s it.
Edit: Come to think of it I did use a revanced modded client. Perhaps this was the reason.
I would guess maybe that’s what’s causing the issue for you then. If a bunch of bots were doing something using that IP address you may have just got caught up in that. I don’t know how much help reddit’s customer service would be if if there even is an outlet to dispute it, but maybe somewhere in the notice page you’ll find a way to ask for human review.