I am not beginning to drive any time soon so not much knowledge on cars, but seen from videos and discussions that at least in some models telematics are done by a box that can be unplugged, and it depends what functionality you can lose from this. Buying only old is probably not a longterm option, so would instead be looking at disarming upcoming ones. We really need a database on how eadily it is done by model and what impact it would have.

You can always install an EV conversion kit to old cars.