With the story of Target figuring out daughter was pregnant before the daughters father, it gives rise to all kinds of "Movie plot" plausible sounding scenarios.

Movie plot: Two people meet up, have fun, then go their separate ways. 9 months later she has a kid, dad doesn't know. But FAANG knows...

The problem with "plausible movie plots" is they are often overrated in terms of % chance of happening.

With linked graphs and relationship trees, it doesn't seem impossible "The Algorithm" could figure out you have kids before you do, or at least base it's Advertising results on a % chance guess.

Which is crazy, but often does happen. I have a nephew and niece, so I've bought baby / small-child stuff, but mainly just around major holidays and their birthdays. And yet I still get plenty of random product suggestions on Amazon for kid-related products, even during the 95% of the year that I'm not looking for that stuff.