This is AI-generated music, but it's misleading since it's not labeled as such. The flood of this kind of content is spamming RU-vid and RU-vid Music, and it's really bringing down the overall quality of the platforms.
Why? Personally, I've grown to love the sound of ai-jazz over the last month. It's distinctive and I would never mix it with the sound of acoustic instruments. I don't think people should say it's second-rate music, it's beautiful and that justifies its existence. And whether you like it or not is a matter of taste.