Great question. It feels like there's no real options here except buying older cars. Mozilla did a review and every brand they looked at flunked

https://www.mozillafoundation.org/en/blog/privacy-nightmare-...

The "least creepy" were Renault and Dacia and the "most creepy" were Nissan and Buick.

Apparently there's tools like Privacy4Cars that could help you delete your car. Based on their website, it seems their primary customer is enterprise

https://privacy4cars.com/

This Mozilla report is low quality and treats legal boilerplate as proof of them spying. It says a car is snooping on you via its microphone even if that microphone is purely used for support Bluetooth calls.