The car maker will gather your mundane data, and all other services you, your friends, parents, parents friends and employer use will also do that. Then data will be deanonymized, traded, aggregated, traded around some more and aggregated again. Suddenly all actors have a complete profile on you and your social network, where they can very accurately infer many data points not explicitly collected. Good luck gdpring every company in existence. Your profile is eternal and growing. Also 20% of entities holding copies of your data also didn't care to keep your data safe and lost it to the criminal element. Somewhere on the dark net you can now buy access to a database where you can query for that shopping list you sent over your cars entertainment system and also your sexual preferences and social security number.