I suppose it searches your configured sources for that movie and comes back "not found"

Stremio does this. Stremio is a legal application that finds media from any configured plugin. You're supposed to add the illegal Torrentio plugin to automatically pirate media. By doing it this way, most development can take place in public.

A similar situation exists with the emulator Azahar and the illegal fork Azahar Plus which can automatically decrypt games.

Edit: lolno this project just has pirate sites built into it