Earlier quoted context omitted.
You're joking, right? The systems are locked up tight. I did manage to hack into my Porsche Macan's system so that I could turn Apple CarPlay on (it's disabled in the Macan, but supported by the system because the unit is shared with the VW Atlas which has CarPlay), but it involved a pretty complicated jailbreak.
You're joking, right? Only 3.1415% joking. I predict people will eventually get credits for saying things like, "Brought to you by Carl's Jr." in their car, bonus if the kids also repeat it. But seriously I figured someone would have found Easter-eggs by now that allowed some form of super-duper-root similar to windows god-mode. I am honestly surprised that car manufacturers have not been sued into oblivion for addin…
I believe since I did it, somebody found another way in by inserting a malicious payload into a USB firmware update image.