Canonless Fandom: does not exist.
The crux of fandom is its canon. All stories that are part of some fandom are based on some work – whether it is literature, film, or even reality. A fandom is molded, folded, created by its canon, and there is nothing more important to its existence than the word of god. Fandoms are groups that are fanatically devoted to their canon; it only makes sense that they would be shaped by their type of addiction, in the same way that people discriminate among types of alcoholics.
And indeed, there are no two fandoms alike. Small, large, kind, cruel, absolutely insane, communities value their differences and certainly, no one could change them. Fandoms are remarkably resistant organisms, facing off against mainstream societies and themselves on literally a daily basis. The only thing that has any affect on fandom is its master. And even then, fandom is not an obedient pet.
In fact, fandoms often fight against their creators, an act which many, inside and outside the fandom, perceive as ungrateful. The implication is that what is written by god, is what is meant by god, is what can never be questioned by man. And most of the time, I agree. This is a reasonable argument – because challenging canon is always a risky move. You are not only fighting other loyal fans, you are fighting your group’s existence; the foundation upon which thousands of works are based. When you’re undermining your own meaning, where can you stop? What can you consider absolute truth, and what is debatable?