Allowing anyone to upload video and then serving it to anyone in the world, at no cost, is not a viable business model. There’s no competition because there’s no money to be made here.

If you’re using the android Auto app then I don’t see how the OS even matters. You can turn off Google location services but I’ve never tried that with android Auto.

You have to sacrifice something. It’s generally not possible to use cloud-based services while maintaining total privacy - at least not in a way that’s convenient.

Here’s what you can do - get a car with minimal tech built into it’s head unit. Get a new head unit and get a car audio shop to swap it out for you. This will void your car warranty if it’s new, but some HUs have navigation built in (not Internet dependent ) and support simple Bluetooth .

If you want full Android Auto capability then idk if it’s even possible to meet all your stated requirements.

If you’re not going to spend 20 hrs on a diy solution that costs 3x what an off-the-shelf solution costs then why even bother .