This is actually a great comparison, because I think both boil down to (a lack of?) informed consent. I think there's nothing inherently wrong with selling all your data for $20 a month. If you know exactly what you're doing.
Very likely the kid didn't understand exactly all the risks and wasn't informed when selling his kidney. And I would guess it's the same thing for a lot of kids signing up for this facebook thingy thinking "free $20 a month? Let's fucking goooooooo!"
But I honestly feel just as creeped out by apple dictating what people can install on their phones and what they can't.