I wonder if you can delete your entire existing history to sort of reset the recommendation engine? i've definitely had to delete individual ones from my history to downrank similar ones in the past.
I don't want to be glib - but perhaps it is because our "context window lengths" extend back a bit further than yours?
Big tech (not just AI companies) have been viewed with some degree of suspicion ever since Google's mantra of "Don't be evil" became a meme over a decade ago.
Regardless of where you stand on the concept of copyright law, it is an indisputable fact that in order for these companies to get to where they are today - they deliberately HOOVERED up terabytes of copyrighted materials without the consent or even knowledge of the original authors.