I would assume that's quite a hard project, considering that even for Netflix it took two decades of research and world-class AI competition(s?) with a million

I would assume that's quite a hard project, considering that even for Netflix it took two decades of research and world-class AI competition(s?) with a million dollar prize(s?) : https://netflixtechblog.com/netflix-recommendations-beyond-the-5-stars-part-1-55838468f429 https://netflixtechblog.com/netflix-recommendations-beyond-t... (Note that was for the much more USA-focused DVD by mail Netflix, so the current problem might be even harder to figure out !)