Amazon Prime Video is able to remove a video from your library after purchase.
We are contacting you regarding a past Prime Video purchase(s). The below content is no longer playable on Prime Video.
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I mean... yeah? That's one of the main reasons why you want to have your own Plex (or, Jellyfin) library, that way you control what media you have and it can't be taken away from you at any second.
This is the answer. The secondbthey banned episodes of IASIP I spun up an Emby server and downloaded the whole series.
Now I have every episode of every show I love, and tons of movies and music all in one place.
It's basically like having a personal Spotify/Netflix combo.
I couldn't imagine paying money to "rent" a video file