I think evaluating alternatives to GitHub is going to become increasingly important over the coming years. At the same time, I think these kinds of migrations discount how much GitHub has changed the table stakes/raised the bar for what makes a valuable source forge: it's simply no longer reasonable to BYO CI or accept one that can't natively build for a common set of end-user architectures.

This on its own makes me pretty bearish on community-driven attempts to oust GitHub, even if ideologically I'm aligned with them: the real cost (both financial and in terms of complexity) of user expectations around source forges in 2026 is immense.