Well there are big YouTubers who don't make conversational content and just open up video responses for anyone (to generate backlinks, I guess) no matter what their videos are about. Using this can get you some traffic, as well as subscribers, as well as dislikes....
BTW:
Did you make your University video a response to one of the Talk videos? There were so many good responses on the first few topics they discussed but not a single one on the last 2 topics, so I was wondering if people don't respond anymore, or if they, for whatever reason, just haven't approved any lately?