It's a cult. It wasn't one when I first moved to Boulder, but then TH changed. It was a gradual shift, never enough to notice at any given time. I was a frog in the slowly warming water around a charismatic leader. I'm grateful my wisdom made sure I had little potential as a runner. If I had, I'd probably still be there.
I've looked at a lot of online sources. The Cult Education Institute has several articles based on stories taken from The Daily Camera, Boulder's newspaper. That link takes you to one article, with links to others at the bottom. This article from Newsweek is well researched. There's also this one from SI, and one in the New York Times. Oh, and a Wikipedia article.