Two different situations
I've got no problem with the adults in the story. It's slavery when you don't have a choice. I expect this kind of work appeals to young men a hell of a lot more than hauling bales or something out in a field.
The word "exploit," like a lot of other buzz words, has been broadened to the point where it's almost meaningless.
But when you're talking about the children in this story, that's a whole different kettle of fish.