Chances are the dealer and manufacturer can still get telemetry data through the cellular modem built into the car. You will need to remove it to be reasonably sure that data isn't extracted.
I know they are because they called me for service at the 10k km mark, but at least they’re not charging me for the pleasure.
>Chances are the dealer and manufacturer can still get telemetry data through the cellular modem built into the car.
Exactly why I have a car without a cellular modem. They're getting quite rare, though, and I imagine will soon be impossible.