I have “Onstar” on my vehicle, but am not paying a subscription for something I don’t really need. And the fuse is pulled on that system. And the mirror is also disconnected,so I think I am free of them.
Onstar is just the satellite half of the system. Depending on how new the car is they are now bluetooth and WiFi and hooked to the “Internet of Things” around you. Ring cameras, WiFi routers, cell phone data networks... There is a sub-layer channel of ALL these technologies that collects data from everyone and every device it can in real time.