I think this could be a big concern in the future - and imagine the possibilities with the self-driving cars that some are promoting. I just got a new car and the connected features were standard, not even an option. It included a free 6 month trial that I have not, and don't plan to activate. There is a whole book devoted to the terms, condition and privacy policy for this system. It points out that they can still access many of the system's features even if you don't subscribe to the plan. And they also state that the only way to completely disable the system is to physically remove the hardware.