I've not studied this specifically but I do have a general interest in the complex control systems now in cars —and I try to avoid them.
I think that, from watching the likes or Rich Rebuilds, who ostensibly operates without any approval from tesla, the cars will run without the internet but I guess they'd become "feature complete" and when modules die it will be on the car hacking community to pick up the mantle.
Traditional cars aren't in a much better position as somewhat superfluous modules (think a radio head unit) can take down one of the many CANbus networks in your car and leave it a brick.
Many (most?) auto techs are not well versed identifying these types of low level problems and will fall back to firing the parts cannon at the car rather than identifying the issue definitively. Just like in Battleship you can get a hit by random guessing but this is a waste of money and resources.
The random superfluous modules also become unavailable and if they're critical to making the car start then your car might be out of commission for the foreseeable future. GM and Ford just don't have as much of a social media halo around them.
You do see a few headlines around particularly egregious money digs, like one company making remote start a subscription feature. That module and the car it's in is not built to last in my view.
If the viability of the company relies on the hype machine then it’s pretty relevant what kj d of person is “renting” me the car