VW's new Rivian-based UX platform is based on AOSP Android, without Google Automotive Services (GAS). Bad news: You don't get the Play Store. Good news: Rivian could choose to open source the parts of the system that replace the GAS bits.

It's such a lucrative revenue stream that I doubt companies will be convinced of any utility in open-sourcing. Similar to AI regulation, the car companies can just claim that any public access to the code will make cars more dangerous.