You can import the song into those streaming sites. Save the song to your phone. Listen to it on soundcloud or youtube
And you don't see how that's much more difficult than it simply being on iTunes or Spotify? Apple Music fukked everything up with the update, because now it's frustrating as all hell to import mixtape songs ... or songs not on iTunes.
And forget Soundcloud or YouTube. I'm trying to throw my Spotify playlist on shuffle, or listen to it as part of a complete project ... not having to check my phone every five minutes after a song ends.
And I didn't know you could import songs to Spotify. Even still, you can't do that simply on the go via mobile devices. Need PC.