Food for thought: when thinking about over-centralization and propietary SaaS, it is a mistake to think of GitHub as a developer tool. It is first and foremost a social network -- the tooling that comes with it is pretty trivial.
Mastodon is the best way to keep up with what's happening.
Follow anyone across the fediverse and see it all in chronological order. No algorithms, ads, or clickbait in sight.