Focus on open protocols, simple formats over complex vendor-specific cruft. Then you can always "fork" away from an enshittified saas.

I bet a small team of the quality of the kind developers who are attracted to hacking on Ghostty could recreate the subset of GitHub functionality they actually need in ~six months. It's just the problem of how to pay for the ongoing care, maintenance and hosting? Maybe another opportunity for Mitchell's particular brand of philanthropic OSS.