I would also want to know how much stuff is tracked. Disney knows the secret, that the shortest path to a parents wallet is through the kid, I am not against Go

I would also want to know how much stuff is tracked. Disney knows the secret, that the shortest path to a parents wallet is through the kid, I am not against Google-Youtube making money out of this, but just want to know what is and what is not tracked. Of course, ad policy will also help.