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Google admits Spotify pays no Play Store fees because of a secret deal | TechCrunch
(techcrunch.com)
This is a most excellent place for technology news and articles.
According to this random site with no sources the ranking is: Napster, Tidal, Apple, YouTube Music, Deezer, YouTube, Spotify, Pandora.
Wonder where SoundCloud fits in.
Pretty sure no one uses that for exclusives only because it will get so few plays