Just don’t get a car with connected internet, or smart X in any way, which is most modern cars unfortunately, and if you do, disable the telemetry. I have a clean, cool, low mileage ~15yo car, has no screen or apps, no internet, no back camera or even digital dashboard. I put a screen that has offline CoMaps app, if I ever needed it, and its OBD connected to a local app that does usual diagnostics. Sure, there’s logging I see and it happens, but it’s all local and never shared let alone connect things gas or odometer or driving habits.