How in the seven hells is this a problem of the network protocol? Or any other technology, really? I seriously don't want to take this offtopic, but what you are describing is a problem of the parents/guardians first and foremost, and has absolutely nada to do with the technology we are discussing.

Appeals to emotion like this and the sad truth that they work so well are the exact reason we need decentralized, censorship-resistant networks in the first place. To put it polemically: No, I don't want to "think of the children" because that's the job of their goddamn parents.