You're talking about mainstream adoption. With growing adoption will come attention from governments. Children are an active internet users. Theoretically they might be interested in Nostr, for example, in the donation mechanism. Laws are protecting children. Nostr community can't ignore the problem of shocking content just because it's parents' task. Because it's government's task too. At least parents expect the state to do this. Eventually relays will be blocked in developed tolerance-oriented countries and no mass adoption on the board anymore.