Comment by fc417fc802

I don't entirely agree but neither would I be dead set against such an arrangement. Consider that (for example) while private banks are free not to do business with you at least in civilized countries there is a government associated bank that will always do business with anyone. Mobile devices occupy a similar space; there would always need to be a vendor offering user controllable devices. And we would also need legal protections against app authors given that (for example) banking apps are currently picking and choosing which device configurations they will run on.

I think it would be far simpler and more effective to outlaw vendor controlled devices. Note that wouldn't prevent the existence of some sort of opt-in key escrow service where users voluntarily turn over control of the root of trust to a third party (possibly the vendor themselves).

You can already basically do this on Google Pixel devices today. Flash a custom ROM, relock the bootloader, and disable bootloader unlocking in settings. Control of the device is then held by whoever controls the keys at the root of the flashed ROM with the caveat that if you can log in to the phone you can re-enable bootloader unlocking.