For people who don't watch the video but read the commentary here. CBC found that "faceless" YouTube entrepreneurs have been churning out disengenuous content. They seemingly have no ties to governments or businesses with ulterior motives, instead they are just chasing revenue and posting stuff that gets views.
What I don't think the video does a good enough job of though is explaining that algorithms monetise rage bait and thereby amplify fringe viewpoints.
Good questions. They didn't go into that enough.