Thanks. So it was related to MP3 playlists. I still don't get it though. Why is it triggering Github to ban accounts? Is it a random glitch, or is some automated process flagging up that people are using Github to store their MP3 archives --and acting accordingly?
I don't know the reason, but I don't like it. Nothing is wrong with that content, as you see its literally defined in the RFC.
I'm not brave enough to try with my account, but I wonder what happens if you do that from the command line and then create a PR in someone else's repo.
I think it only impacts new accounts, because you can find older files on GitHub with that content. Not sure though.
This is scary. This is why you should use sourcehut or self-host.