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

the interface shows the top movies right now on https://www.themoviedb.org/

It could just be streaming the trailer.

I’m not against piracy but the initial pitch made it seem like it’s more purely for trying to cast streams embedded in websites that you already are visiting and/or have access to, of which do not “allow” you to cast, or for whatever reason only work on a laptop and not on something like AirPlay. But the LLM-slop description of “random websites” in addition to the option for a TVDB API key confuse me as to what the actual focus is here.