What I would genuinely like to see in ChatGPT and similar services are well-implemented parental controls that allow a parent to monitor a child's conversations and get reports on them.
Yes, I think parental controls should generally be transparent to children.
That said: Let me be clear that I'm very happy I'm father to a two-year old and we have some time to figure out our "AI policy" still, and for the tech/services to improve. I don't envy parents to the 8+ crowd currently.