Electric cars are not that great for the environment if you look into it deeply. Purchasing an old car and having things rebuilt like the engine are much more sustainable. You could also swap the engine out for an electric motor.

The largest block to having modern private cars is that laws require cars to have driver monitoring systems and kill switches installed. Cars also have microphones in them for hands free calling, emergency calls, and active noise cancellation.

Connecting your phone to your car is also a huge privacy invasion as now your phone that knows everything about you is tied to an invasive vehicle that takes you everywhere. A data aggregators wet dream.

You would need to remove the sim card at the minimum but it's impossible to know ahead of time if that will detrimentally affect it's functions and throw codes.

I have read about work being done on Linux operating systems for cars that I assume would be more open to modification but I don't think we can expect anything reasonably private anytime soon from that.