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That’s not gonna stop them. They can arbitrarily make as many accounts as they need to do it, and just bounce from account to account one comment at a time if necessary.
There’s a finite number of servers though that they can create accounts on.
The admins of those servers would notice someone spamming account creations just to make comments and bypass bans.
What you’re describing is not a federation issue, it’s a server admin issue.
Yep, the same thing happened on Reddit. Account banned? Make a new one.