For some less click-bait-y information, check out any of the “Car Hacking Village” videos from the past 5 DefCons. They go into great detail about what new vehicles actually do.
For example there was an extended period of time where any asshole could make themselves into an admin and get, and change, information on ANY car sold by a particular manufacture: https://www.youtube.com/watch?v=qNuS0rvqc8c



https://gmauthority.com/blog/2025/07/this-little-known-reason-is-why-you-shouldnt-ignore-gm-over-the-air-updates/
First example I could find.
The computer network in your car touches everything, engine control, powertrain, body control, SRS, emtertainment system, stc. If the dealer thinks they can get away with denying a claim because you “damaged” the vehicle by removing the cellular antenna you know they will. And it’s not like you can just pop it back on before you bring it in, new cars are streaming data 24/7 into the manufacture’s network, and is visible to the dealer, whether you pay for car control the app or not.