m3u8fetcher is basically just a basic List View with Groups that contains videos (that you have to manually add), it depends on online links of who host the files that it needs to render.
the best use for this is to watch pirated movies from pirated websites (thats what i do), you get the links by either fiddling with inspect element or just using a third party program
(Internet Download Manager) and downloading the file but instead of downloading it just copying the link.