Look, I'll just be honest, if you routinely post with the same anonymous username and you annoy me, I register it myself. It's hilarious to me.
My favorite is when people get upset that someone "stole" their preferred handle. YOU CAN RESERVE IT.
Also, protip, you can just use a fake email address to register a username, as long as that email address hasn't been used before. for example "
" could work. No need to go to the trouble of getting a burner email, anything that looks like an email will do.
Happy handle stealing!