Car companies aren’t stupid though, they know that they make money from their own closed little ecosystems of car parts and servicing and they’re potentially handing Apple and Google control of something worth a lot of money. Hopefully, they’ll get their cut and we can have nice things but we’ll see.
You’re close to the point but missed the elephant. The valuable thing we’re fighting over in this case is all the data collected by the cars.
Automakers lose some access when it’s Apple or Google serving the infotainment. Apple and Google also get access to this data for free.