What kind of device would that be? I'd love to support it.
Dual booting and unlocked phones still exist (second hand fairphone or even pixel is an option) which at least let you own the user land. As do the linux projects stated. There were quite a few dual boot capable phones a few years back, but they received little interest.
Smart home devices don't need to connect to the cloud. Buy a zigbee one if you really need a remote control your light bulb.
TVs that don't connectto the internet still exist.