I see what you're saying but I don't think that's the answer for everything, because people also pay for conveniences, like a Ring subscription so that Amazon stores footage in their cloud for you.

The problem is centralization is more convenient for consumers. You can easily control your doorbell, your garage door, your security cameras with 1 app, and everything just works.

Open source and decentralized solutions need to be just as convenient and cheaper than centralized ones for consumers to choose them.