DNT is a client header that failed to get traction and never did anything useful. RTA is a server header and small children will not be doing this for the most part and parents can of course disable parental controls assuming one day they are enabled by default for child accounts. Like I said, it's not perfect. Teens can of course bypass this a million different ways. For every 100 million dollars a company spends to lock teens out of something is just an extra 5 lines of python or 15 seconds of their time on AI if that. Currently many teens watch pirated movies and porn together in VR and assorted games that allow placing a media player in G-rated world building games.
It's probably worth noting that if teens can not view porn, they will likely produce porn making an entirely new tax free underground market on Tor or other networks.
This is just for keeping small children out. Nobody in the history or future of earth have ever or will ever locked teens out of a thing. Archive this comment so we can review it at a later time.