Android Auto is a proprietary standard that's basically glorified spyware - if one thing isn't being fed to it 24/7 exactly as Google wants it so they can sell it, it breaks. It's basically just that there are a lot of dependencies that it would need that are fundamentally incompatible with privacy.
itch.io is fantastic. Mostly indie stuff with some bigger name stuff, but it's by far the best out there for devs.