Hidden in the manual that most people don't fully read. And I have worked with computers for a long time.
Apple could have publically advertised that in-app purchases were turned on.
But they enjoyed the money stream. They enjoyed it so much that they hid this feature, while advertising all sorts of other features.
I realize that there are people who exist who worship Apple and will always defend them, and then blame the busy parents who didn't fully read one of many manuals they receive when a product is purchased. Well, it looks like governments and courts in many countries felt they were targeting children. So you lose, but you will keep on blaming the parents because Apple can do no wrong.
Roll Eyes!