This is absolutely completely wrong. No music service supports FairPlay aside from Apple Music. Why would they?
Music you buy from all services is DRM free and music you stream is only in the apps and have no need to support FairPlay. None of the music subscription services allow you to download music and use outside of the app.
Even the ability to play movies bought in one store and being available in another store as a purchased item is supported via MoviesAnywhere integration and not FairPlay.
