I pay for Youtube and see in the results a lot of irrelevant videos that have nothing to do with my search or viewing history.

But it gets so much worse. I leave the "smart downloads" feature enabled in Youtube Music on my phone because sometimes it discovers and downloads some gems for me. Again and again it downloads "artists" and music genres that I went out of my way to never have to listen to. To add insult to injury it sometimes refuses to delete those playlists for hours after I click the button. One time I had to clear all the downloads just to remove that trash.

There is no "organic" explanation for this as much as I'd dig for one. This is Youtube taking money to push a product.