The problem is opt in isn't actually opt in because they're depending on the integrity of the scummiest industry in America. They're supposed to sell you on it and they get a bonus for everyone that signs up. So what actually happens is that page gets clicked through before you know what it is.

Never, ever trust an opt in/out at all unless it's open source and audited. Otherwise, you have to trust that they'll do the right thing.

Or, hope that unplugging is not only possible, but doesn't break anything else.

At least Hyundai might be collecting and sharing data without consent, and I wouldn't be surprised if others do it too. Based on just this anecdote from Security Now, but still. https://piped.video/watch?v=GR28LQbIiAY&t=3471