[Ukv]

I'd say network filtering, like already done by schools, would be preferable. For privacy concerns there'd be no need for handing over your ID to see websites, and for ownership/treacherous computing concerns the home router and phone plan are typically owned by a parent so there's no need for devices working against their owner. Mostly feels like just a matter of sorting out UX/defaults and pushing towards standardization.

Not impossible to bypass, but nor is the current approach. Likely more effective in that it only requires compliance from a handful of entities operating commercially in your country rather than thousands of websites globally.