"QAnon" is the community of people who subscribe to the idea that "Q" is leading them to some hidden truth. I got these ideas by seeing thousands of people identifying as QAnon followers express every one of the ideas I listed above. You just have to look at any one of those famous people's tweets to see QAnon replies baselessly accusing them of horrible things. The codeword used for the supposed Clinton video in QAnon is "frazzledrip".
The nature of "Q", or at least the current person publishing under that guise (likely Jim and/or Ron Watkins), is that they rarely make any kind of concrete claims or predictions, but they've certainly made allusions to Moloch, Satan, cannibalism, etc. when referring to political figures. It's the responsibility of "bakers" in the community to take "Q"'s "crumbs" and come to conclusions. Certainly these conclusions have been widespread in the community for years and have not been spoken against by "Q".