There could be a sort of "ARM" or "Android" but for cars.

Come up with few general hardware modules, enough to replace the head unit, body controllers, ECU, climate control, and ideally driving automation, and software to run them. Everything minus safety modules like the airbag controllers, and then license them under Fair/non-discriminatory terms.

Then, a variety of automakers get access to core functionality and cheaper hardware to run it. That means that the cars themselves can have higher quality software, cheaper hardware (from cutting out companies like Bosch that charge exorbitantly for things like a windshield wiper controller), and thus deliver more value to customers.