There's a legitimate problem they're trying to solve there: there are several ways to sort media that don't match up well with a hierarchical filesystem¹. They solve it badly. Good players maintain a database for efficient queries of media metadata, and periodically rescan the folders to update it. Shitty media players try to manage the files themselves, and still end up needing to maintain a database. The worst of these use the database to manage the contents of their storage files (or store the files themselves in the database), if something isn't in the database they delete the files. Adobe Lightroom Classic does this, if your database gets corrupted it deletes all your RAW files!

¹E.g. if you've got music, and it's sorted `artist/album/track<n>.extension`, and two artists collaborate on an album, which one gets the album in their folder? What if you want to sort all songs in the display by publication date? Even if they use the files on your filesystem without moving them, some sort of metadata database will be needed for efficient display & search.