As someone on the periphery looking in, it's because they make up a large web. Its an extended community that shares a lot of people between its many arms. There are also some shared values between all these people, even at the very extended edges. For example, they share a superiority complex. From my experience, most of these people believe that they see further or know more because they believe in certain things that are, on their face, unintuitive. I don't want to pass more judgement than to say, having members believe contradictory or outright falsehoods is a thing that cults do. I'm not saying this is a cult because I haven't seriously sat down and thought about it but that is reminiscent of something cults do.