It seems that YouTube is killing them all but I don’t know the technical details, via FreeTube I noticed, from this link (https://api.invidious.io/), that there are very few left and they require signup, and probably financial support from users.
I don’t know how, but the Android app LibreTube with instance passthrough enabled still works.
LibreTube uses Piped instead of Invidious. I tried LibreTube, but some subscription videos don’t show up because of an upstream bug with Piped. I am continuing to use Tubular (a fork of NewPipe that adds SponsorBlock) until either the Piped bug gets fixed or until NewPipe finishes rewriting their code.
rewrites never end well.
NewPipe seems to acknowledge this: “Anyone who’s been in the FOSS community for long has come across at least one or two failed rewrites or refactors, and we don’t want to repeat such tragic history.”
It’s been a year and a half since they made their post. I’m fairly certain they plan to take as long as they need in order to make sure not to repeat other’s mistakes. Plenty of rewrites do end well. Once NewPipe finishes their rewrite, I have no doubt that it will be a bit bumpy for a while. It’s a drastic change, so issues are bound to crop up. I have faith in them.