You're on Facebook, you have a baby, you post photos of your child on Fb and he/she becomes an entity in Fb's database. Your child grows up and eventually creates his own Fb/whatsApp/Instagram/whatever account and the cycle continues with his own children. This is just the beginning, folks.
However, that is related to the point you made.. though you seem to be trying to write it off as a non-concern by using the 8 year old with a pony example.
To your point, I wonder what happens to people psychologically when they have to be ‘on’ all the time. We’ve built up too much of a culture of judgementalism and one of the aspects of recording everything is that everyone knows your business. It’s like living in a small town. Which, incidentally, a lot of people move to the city so they could just be treated as a random person when they go into a store instead of Betty and Charlie’s boy.