Also, you can write Javascript apps that run in the web browser.
I did a bunch of hackathon projects using that data when the Model S first came out, now there's an ecosystem of apps and stuff available for the cars.
I won't fault your opinion for Tesla having more access to your data than you might like, but your opinion about what you can download seems a little incomplete.
As emissions standards get tougher makers are relying on increasingly complex fuel and emission maps that are also proprietary. There is nothing stopping you from building an electric car today from Open hardware and software. The same can’t be said for ICE cars.
Yet motorcycles are road legal. I honestly don't understand the law some times.
You get the barebones version of a much smaller selection, sure, but the vehicles still tend to be serviceable by in-house/shadetree mechanics instead of the dealership.
Maintain a certain distance from another car when I set the cruise control? Sure, that's not a bad feature.
Play a nasty little ad on a touchscreen "infotainment system" that is downright distracting to use as it is, especially when driving? That sounds like disaster waiting to happen.
All modern cars are all proprietary, and their hardware/software is mostly garbage that can't be tinkered with, fixed, or modified.
If that's the only option in the future, I'll take my welder, and my old cars and head for the hills to try and finish off the rest of my days in relative peace -- free of intrusive spying and advertising.