> People are mad at Musk. But they themselves have bought the proprietary car

These may in fact be two different subsets of "people"

I understand what you're saying now and agree with that sentiment. People are insane to buy car trackers with subscription services. Those things are horribly anticonsumer.

Most cars are "proprietary". The only cars that come close to being open is older vehicles that are no-longer manufacturer with a good after market parts market.

e.g. I bought a Land Rover Defender because it is the closest thing to an "open source" vehicle. However you are giving up many modern conveniences and you will be doing a lot of work yourself.