I'm missing something. How is the data actually collected? How does it get out of my car? My car doesn't have any cellular features other than CarPlay. It has wifi, but I've never used it.
It seems a lot of the new ones have a cellular modem. On the surface it's to let you remotely access the car or do a remote start. Even if you don't pay to subscribe and use it for your purposes they can utilize it to transfer out the data.
Cellular is usually how the vehicle provides Wi-Fi, it is effectively just a cell hotspot like you would get from a ohone carrier, but tied into the vehicle. So I think that would be the common way they get the data out.