Turn on a movie. Any movie. Just be prepared to dig. And for god’s sake, read the user reviews before you press play.
Search for "vampire movies." You will get Let the Right One In sitting next to Abraham Lincoln: Vampire Hunter , sitting next to a movie called Vampire Zombie Werewolf Shark 3 (real title placeholder) with a Photoshopped thumbnail that looks like it was made in 15 minutes. The algorithm does not distinguish between quality and quantity. It rewards keywords, not craftsmanship. Veteran horror viewers have coined a term for the specific flavor of cinema found here: "Prime Trash."
The horror on Amazon Prime isn't just the movies. The horror is the interface. The horror is the ads. The horror is the realization that 90% of the genre you love has been reduced to algorithmic filler.
Scroll through the Horror section on Amazon Prime Video, and you will quickly sense that you have not entered a library, but a vast, uncatalogued swamp. Amidst the algorithmic recommendations for The Rings of Power (why is that there?) and the reliable presence of Hereditary , you will find a churning ecosystem of low-budget desperation, direct-to-VOD schlock, and occasional, shocking masterpieces.