Open Source car hacking is becoming a thing.

https://en.m.wikipedia.org/wiki/Citro%C3%ABn_Ami_(electric_vehicle)

Basically, no. https://foundation.mozilla.org/en/blog/privacy-nightmare-on-wheels-every-car-brand-reviewed-by-mozilla-including-ford-volkswagen-and-toyota-flunks-privacy-test/

At some point my '96 Legacy is going to die and my plan is to go without a car for a while and just rock the bicycle.

If that doesn't pan out my backup plan is to find the local group of peope who took an old clunker and put an electric drive train in it. I'll understand how everything works, no privacy policy, no phoning home, no nonsense.