Comment by j2kun

It is worth noting that the Netflix Prize winner's solution was never meaningfully used, because Netflix pivoted from ranking content based on what you tell them you like to ranking content based on clicks and minutes watched.

To say that "we have solved ranking" because Netflix decided to measure shallow metrics and addiction is... specious at best. Instead the tech industry (in all media domains, not just streaming video) replaced improving platforms and services in meaningful ways with surveillance and revenue extraction.