User blog comment:DaNASCAT/Technical Update: September 16, 2015/@comment--20150918173549/@comment-26009167-20150919221007

Ripto, if by your first question you're saying that you don't see the uses for SoundCloud or Spotify players, then I could think up a couple uses. A page with lyrics for a song could have one of those there to let the person listen to said song without needing to open YouTube.

Another use, although rare, could be for podcast playlists. For example, my main wiki has started doing a podcast recently - if we were to upload those podcasts to SoundCloud, we could just use the SoundCloud player to play them instead of forcing the YouTube video (useful if the person is in a location that blocks YouTube).