iirc (it's been a while) they where on rackspace when Microsoft bought them out - there was an article a few months ago saying they where moving to Azure and freezing new features while they do the move[1].

[1] https://thenewstack.io/github-will-prioritize-migrating-to-a...

Honestly I don't know half the features they have added because the surface is huge at this point everyone seems to be using a (different) subset of them anyway.

So a feature freeze isn't likely to have much impact on me.

EDIT: went and checked - https://github.blog/news-insights/github-is-moving-to-racksp... not sure if they moved again before the MS acquisition though.