If books were collecting every scrap of data they could on you, and every new page you turned to was algorithmically changed using data collected from your reading history and from additional information purchased from data brokers, and the words and pictures were being used to manipulate you and encourage you to engage in harmful actions ranging from sending the publisher nudes to killing yourself then yes, we should probably have some kind of regulations on when and how children use those books. Facebook's own internal research shows that their platform is harmful to children. We don't need to depend on opinions of child victims.