I guess I was going more for the legal reasoning rather than technical. Yes, technically disabling a computer is trivial. I just can't see how a company can do that when it's legal property of somebody else. That's just a lawsuit waiting to happen.
The car still functions so not fully bricked, but I see the argument that the purchased self driving function is bricked. Wouldn't be surprised if there's language in the agreement that deems it as a service. Just another shitty business practice to increase bottom line.