If I get a car with an advanced computer, I expect to be able to install and run whatever software I want on it. Just like any other computer.
If I can't, then I don't own the device.
When the car malfunctions mechanically it can be a basis for a lawsuit for the manufacturer. There is a practice of recall in the industry. So what would happen when software that you run on the car's computer malfunctions or you accidentally install malware on that computer? Do you blame yourself or manufacturer? What if there was a loss of life because of this malfunction?
The same thing that would happen is you modify the mechanics of your car (which is entirely allowed, as it should be) in a way that causes breakdown or even loss of life. It's on you, not the manufacturer.
