A five year old is not prepared to engage online with privacy. They have not had the necessary training yet. They will not get that training unless you are there to show them how to negotiate that world. They will not magically learn how to protect themselves if you just leave them to figure it out themselves.

That description of "100%" means the lack of privacy they're objecting to is one going a lot lot past five years old.

Your first comment didn't mention age, so they made a comment about a broader interpretation of the idea.