Another possibility is not a hack but internal, by YouTube itself using a routine so broad and clumsy that it uses anything that seems to match something, to offer you anything it “thinks” may interest you.
Where might that be?
I’d suspect the jazz music – something in one of those, not obvious to you but soon spotted by the interrogation. The material it gave you might have been a lingerie catalogue, if the images were static poses.
What makes me think that is the way that searching for anything can fill the screen with all manner of links to commercial outfits having no clear connection to what you are really looking for.
I encountered this only yesterday when looking for the location of a church, to attend a funeral. I typed the official name of the church, but it was about a dozen items down the list, with nothing else the least bit relevant despite putting that name on the link it was displaying.
I am not certain what my computer uses and I do not deliberately use Google; but isn’t YouTube owned by the same shower that owns Google? They are all one huge cartel of just a very few US companies.