See the response in this thread, it does as good a job explaining it as I’ve seen:
I know that the immediate question then becomes “Well, how does TMDB still have it?” It doesn’t really matter though. When Plex receives a DMCA takedown request, they are obliged to comply.
It’s been suggested that Plex should potentially source fan art in these cases, just to have something. But the best solution is likely for the user to source their own poster(s) in these cases and place them beside the movie in its folder. That way the artwork you want will always be available (it solves another problem where the Plex Movie agent will sometimes replace posters with different ones).
But the new agent/scanner combo is generally faster, and enables some newer features not available in the legacy agents (Discover Credits, for example). The tradeoffs are generally worth it, in my opinion.
