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...
> I expect that regulations would mean you could not drive cars with modified software
Aggressive regulations for emissions control software + industry deterrence for car modifications via insurance and warranties
Good then that there is very little need for emissions control in EV. No barrier for giving the owner of the vehicle more access to its innards.