> This is about as far from antitrust you can get.
Not really, no.
No DMCA notice is posted, its simply a vague you broke our ToS but we're not going to tell you how or why so you can correct it according to the mods, and then the non-response for 9 days.
Github owns Microsoft, Microsoft has an interest in Content, IPTV like many other technologies can potentially be used by people and businesses for a wide variety of legal uses.
If a business closes an account for cause, you say why, you allow access to the maintainers to migrate (if its not a legal issue), and you keep the account closed.
If you don't say why, block access immediately, and don't provide a legitimate reason, you could be in violation of the Sherman act either directly, or more often via third-party liability when it comes to open source.
I'm not a lawyer, but I know that much, its far from clear that its not antitrust, and on a more personal note, you should be more careful with those snipes. Its against the HN ToS after all.