The repo should mention a warning about usage. Be aware that downloading large playlists with lots of videos from Youtube can get your ip address throttled/ban

The repo should mention a warning about usage. Be aware that downloading large playlists with lots of videos from Youtube can get your ip address throttled/banned. The ban could last a week or a month. It's also not a good idea to use "--cookies" unless you absolutely have to. Just leave out the cookies option and try to dl anonymously. Only when Youtube forces your ip address to "sign in" is it necessary to pass in cookies.