I watched the documentary - it's on Netflix. It's nicely done. The most interesting thing to me is that these people, as far as I can tell, actually fit the definition of hoarders. It's just that instead of hoarding pizza boxes and empty tin cans or cats, they happened to be obsessed with something that others find valuable. Abusive comment hidden. (Show it anyway.)
The one that got to me was AI. The whole movie had an annoyingly tragic air, but the end was just a killer. I still cringe any time it comes to mind, and instantly try to think of something else, anything else.