This seems to me like a story about viral marketing rather than about piracy. For my experience from the time where I spent more time on leisure sites and fand

This seems to me like a story about viral marketing rather than about piracy. For my experience from the time where I spent more time on leisure sites and fandom sites, it's pretty likely we would organize a scavenger hunt and had a lot of discussions if we encounter a fake ebook with the characteristics described. That certainly would look like a viral marketing campaing.