For starters, forbid behaviour and engagement surveillance. Without that data it would be impossible to fine tune the apps to be addictive for each individual.

For starters, forbid behaviour and engagement surveillance. Without that data it would be impossible to fine tune the apps to be addictive for each individual. Just with that, it'd probably tackle most of the "device addiction". Then if you want to go the extra mile, consider forbidding things like personalised recommendations, infinite scrolling, auto-play-next, loots and even notifications on by default.