> All cameras (glasses, phones, etc.) then blur your face in recordings.

that requires too much goodwill and effort from the makers of such devices. They know their audience wouldn't want that. They don't give a shit about what people being filmed think.

Nor should they.

Think about it some more. It's all fun and games, until same technology is used against you. There was literally a Black Mirror episode about this very thing.

Culture/social pressures work better than purely technical solutions

There are just two makers of devices, Google and Apple, both proprietary and user hostile and they'll do anything the government tells them. Remember how quickly they implemented that covid tracking bullshit? Yeah.