Historically YouTube would downregulate short videos in their algorithms. The cutoff was 10 minutes, if I remember correctly. So the biggest content creators got used to stretching out any video to at least 10 minutes. I think YouTube has relaxed that a bit recently.

Which is funny in the greater historical context, because in the early days of YouTube you couldn't upload videos longer than 10 minutes.

EDIT: As an aside, YouTube's algorithms also punish you if you aren't regularly uploading content. It was really a perfect storm of shitiness where content creators needed to pump out content constantly, while also ensuring those videos were all 10 minutes or longer. It drastically affected the YT landscape. Content creators like Noah Caldwell Gervais who only sporadically release content because they spend HUGE amounts of effort on what they do release were getting slammed by the algorithm. Again, the algorithm has gotten a little better in that regard over the years. Though it's gotten worse in other ways.