I'd buy any Tesla, even the big truck, if it came with open source software! I don't want a car that's spyware like a phone. Let me be in control of it, let me mod it, let me own it.
Who's going to sell me one?
Not exactly what you are asking for, but did you see that Rivian recently provided a way for owners to disable the vehicle's LTE connection? It's straight In Canada. In the US, you have to ask a dealer.
If you can find a good security vulnerability Tesla will give you root on your car as an award.
Tesla is full of open source software, including the Linux kernel. They probably are GPL violators though.
https://sfconservancy.org/blog/2018/may/18/tesla-incomplete-... https://sfconservancy.org/blog/2019/oct/30/calling-all-tesla... https://sfconservancy.org/blog/2023/dec/21/tesla-no-source-c...
See also this interesting slide deck about the GPLv3 and cars, I expect that regulations would mean you could not drive cars with modified software (similar to what happens with solar inverters):
https://events19.linuxfoundation.org/wp-content/uploads/2017...