OP suggests it's funny that people are mad at Elon Musk. This implies they find the actions of Elon funny, or they're laughing at the people who are harmed. I'm trying to understand why people act like this.
It's comical. People are mad at Musk. But they themselves have bought the proprietary car from him despite the decades of warnings, as I explained above.
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.