Just release it under a pseudonym. The worst they will do is force it off GitHub! Don't redistribute the firmware files if you're really concerned. I am also sort of struggling with this idea so I get where you're coming from.

GitHub is seemingly decent for this sort of thing: https://news.ycombinator.com/item?id=49982498

I wish someone would Fluxer [1] GitHub for self hosting.

It is a bit of a pain to make an anonymous GitHub account. That's literally what this whole identity is (I'm making a Nitter style frontend for a meditation app and I'd rather not take any chances). At this point just use a residential proxy like the Telegram people.

[1] Fluxer is an excellent most promising privacy focused Discord clone.

The UI is almost an exact copy of Discord, which, despite what people will say, is actually very good. More privacy focused alternatives should rip the UI of their competitor if it's good so that users get the benefits of more privacy while knowing exactly how the service works.