This doesn’t really solve the problem. This person used to scramble/delete their own content in the past before they went to delete the entire accounts.

They’re a rather persistent ban evader who can’t accept not being welcome in some spaces on the internet. Even before they started deleting accounts they already used multiple accounts to evade bans.

I’d be happy to hear suggestions for addressing this without essentially banning all new accounts. Preventing new accounts from participating will only result in them aging accounts for a bit before usage and discouraging legitimate new users from participating.