If the author scrolls down another 5 videos and an ad will appear, etc. Shorts are designed so that they can feed more ads/hour to viewers. Both are strategies to increase monetization on the site at the cost of customer experience.
By 'content' I mean the fact that every video has a moron talking for 10 minutes at the beginning. You can search up something as simple as how to tie a shoe, find a promising video with a lot of likes, then click it. Gotta start with 2 ads first, naturally. Then the first 2 minutes will tell you they'll teach you to tie a shoe. The next 5 minutes will be a backstory on the history of the shoe and how it's impacted the creator's life and their own shoe stories. Then a 2 minute sponsored segment for some dropshipped wallet or sock nobody needs, then another youtube ad, then hurried 10 second clip of someone poorly tying a shoe.
Maybe I'm getting old, but I don't see how anyone can stand it anymore.
As for recommendation, the algorithm works perfectly if you make the effort to "Like and subscribe™" to quality channels and videos. It's amazing how good YouTube can be if you curate the algorithm with this – and with dislikes if you have to.
I've gotten recommended videos by creators with <1k subs that I really enjoyed, and many with <10k subs.
I've gotten recommended videos with topics I hadn't really thought about but which I ended up enjoying.
Sure there's about 10% or so that I'm not interested in, but I just mark those as "don't recommend channel" and move on. And the times I just need to check out some stupid clickbait, I make sure to remove it from my history afterwards.