Voting with your wallet doesn't help if everyone does the same thing. Not everyone is willing/able to live without technology.
It's also very hard to figure out what exactly they do before making the purchase, and many vendors change their stance with devices already in the field. Look at TP-Link for example: They suddenly stopped allowing local access to their Kasa switches 2 weeks ago. No more integration with Home Assistant. Yes, they have decided to revert it already. That doesn't mean they can't do it again. I had bought 7 of these plugs because they offered local access. Now I'm a lot less sure of this brand. But the money is already sunk into it.
This is becoming an example of frog boiling in action. The usual retort to mentions of frog boiling is that the frogs jump out but in this case, it's just bigger pots of boiling water all the way down.
How is it beyond your understanding? What is so hard to understand about the fact that 99.999% of people won't have the knowledge or the inclination to do that?