I interviewed with Github recently (a pretty mediocre experience overall) and it seemed like they've fully committed to remote work. They don't even bother with on site onboarding anymore.
GitHub has been fully committed to remote work for years before the pandemic. I suspect they’ll bring back on site onboarding at some point, but maybe not. Sorry to hear your interview experience was mediocre. They’ve been tweaking it, and not for the better in my opinion.