If your Youtube video is 8 minutes or longer (and your channel is monetized), you're able to place midroll ads every minute or so to maximize ad revenue. Typically Youtube only serves a very small fraction of these midroll ads to each user; usually every 10 - 15 minutes. So 16min+ has been the sweet spot.

It's this ad incentive that has made long-form videos more popular on Youtube.

Yeah, I have unsubscribed/stopped viewing many specific creators because of this.

They start cycling content and using innovative ways to make videos artificially longer. Some videos of have "what this video is about" and "Summary" sections which can be even half of the video length in total. Sponsored sections are getting longer. There are longer pauses and less editing. The list goes on.

every 10 - 15 minutes? Thats cute