But activity alone is not agency. For instance, in a tabletop game of chance, players may be kept very busy spinning dials, moving game pieces, and exchanging money, but they may not have any true agency
I feel like this applies to "The boy in the book", in which we are also given multiple choices throughout the course of the story, but the effects of those choices are very limited. We get to choose where Nathan go and who he meets, but we do not get to decide what he ask or what he looks for when he gets to the places where we wants him to be (the Internet search is a major example of this.) The question then, should be to what degree should we get to make choices and should our choices affect the narrative for it to be considered true agency?