What I’ve been reading about on that subject is that cars often have a Telematics Control Unit or TCU that can actually be disabled if you can find it. It’s a box that plugs in to the wiring harness. They also have antennas that could be connected by a wire that you could locate, giving us another option to disable them by just disconnecting the antenna wire. That way the TCU could still talk to the main computers but not be able to send out its data.