Github has been entirely integrated into Microsoft's AI division since the last Github CEO left a couple of months ago (not much of a loss since he was responsible for Githubs AI enshittifaction). Those org-changes alone are plenty of reason to lose trust in Github's future. IMHO things can only get worse with an "AI first" division in charge and now is probably the best time to jump ship, at least it's the responsible thing to do for sufficiently large and professional projects (and I bet that ziglang is only one of many to follow).

> But they'd have to undermine whoever is running github actions

I'm not sure if anybody is running the GH Actions project at the moment beyond bare maintenance work and trying to keep the whole thing from collapsing into a pile of rubble. There is also no separate Github entity anymore within Microsoft, so nothing to "undermine".