Depending on the auto OEM, the embedded SIM might be able to be disabled. If you do that, then such features like remote start and map updates wont work anymore. GM got busted for selling user data to insurance companies. From a Brave search:
"the most recent development is a lawsuit filed by the Nebraska Attorney General in July 2025, which accuses GM and OnStar of using deceptive tactics to collect driving data—including speed, location, and driving habits—and selling it to third parties to create "driving scores" used by insurers to raise rates or deny coverage."
On the other hand, it can be a positive. A relative's boyfriend had his car stolen after he left his key FOB in the car. His cell phone app told him where the car was so he called the cops. The cops wouldn't do anything, so he took the second key and got the car back. The car was about 100 miles from where they live.
You can add a LoJack to any car of any age. It is not smart enough to know the difference...
What a world! That is SO wrong.