There's gotta be a way to disable telemetry. My first thought is to cut whatever antenna is used to transmit your data to the corporation. It could be the same antenna used for radio, but I'd go without radio in a heartbeat if it meant Ford, Chevy, or whoever can't spy on me in a car I paid $15,000+ for.
Of course, we shouldn't have to do this. My first choice is to not give any of these car companies a dime of my money, but literally every single brand is doing it. This disgusting trend of spying on people should be illegal. It's rapist behavior.