The relationship between any creative individual—musician, actor, director—and their fandom is complicated. The term “fandom” itself suggests a certain kind of enthusiast, someone who is so passionate in their devotion that they’re practically unswayable, and the nature of modern fame is that the celebrity on the receiving end of that loyalty is almost certainly hyper-aware of it, and of the protection it provides. (Let me whisper here for a moment: Snyder Cut.) So the Charli XCX documentary “Alone Together,” for all of its heartbreaking honesty on Charli’s part, for all her willingness to invite viewers into her creative process, and for all her candor in discussing her mental health, also raises a question: At what point does inclusion cross over into exploitation?