I have a 2018 Chevy. I get emails from the dealership that tells me when a light goes off on my dashboard. OnStar will give me monthly reports about my driving tendencies (average speed, aggressive acceleration, etc.).
So now that I know big brother has access to my car, am I able to disconnect it from the grid?
Tesla uses this technology on all of their cars, as do ALL of the major car makers. If you disconnect it, the car is disabled, it's been this way for years. kill-switches are already out there.