Google’s explanation is kinda vague:
An auto[-]generated channel is created when YouTube algorithmically identifies a topic to have a significant presence on the site. It might be because there are a minimum number of videos or watch views about this topic. We also determine if the quality of the set of videos in that channel meets some thresholds.Thanks, Google. Thanks a lot.
[Rachel and Ben, what did you do to make Duke so angry with you?]