To follow on, it's a valid point though. /bin/ls can handle different file systems because many other separate people/projects are responsible for the file system specific support (in the kernel).

Youtube-dl should be architected to allow many other people to own the site-specific support (i.e. via a plugin system, with the main "distro" of yt-dl including some popular plugins, which other people or themselves are responsible for), if it was like that then probably this fork wouldn't be necessary.