Why does Disney really need this information for advertising purposes when they already know what shows somebody is watching? I realize that any age/gender can

Why does Disney really need this information for advertising purposes when they already know what shows somebody is watching? I realize that any age/gender can watch any show, and of course a lot of Disney's catalogue is pretty universal to age/gender, but there's going to be some kind of a signal in anybody's viewing history. If some profile is routinely watching a show about makeup or horses or ballet dances, you have a pretty good guess about the age/gender. Likewise if some profile is watching a lot of shows about monster trucks, little league baseball, and RPG games, you likewise can make a pretty reasonable guess about who they are.