[wmf]

That doesn't really square with Spotify's own explanation where equal market share should get equal payout: http://www.spotifyartists.com/spotify-explained/#royalties-i...

[earbitscom]

In that first graph is says X 4 (Artist's Royalty Rate). So it is based on market share, and some rate, which they would have simply said is Y had it been the same for everyone.