Large hosting sites like Tnaflix or Seaporn use these strings to categorize thousands of clips for easier navigation.
The database of the future will not just index words; it will index emotional trajectories. It will know that you are not just searching for "Romance," but for the specific feeling of two people realizing they are wrong about each other.
The way we search for stories has fundamentally altered how those stories are written. In the past, a romantic storyline was confined to the linear structure of a novel or a film. Today, the interplay between search categories and content creation has created a feedback loop.