Spotify is one of those services that it never occurred to me wasn't already truly-global (i.e. penetration into all markets.) But so many of the countries on this map are dark. (And aren't available in the raw chart data, either.)
Is there some other more-popular music-streaming service in these other markets, that's keeping Spotify out? What do they use in China? In Russia?
Or is music-streaming as a whole, just not popular in some markets? (I guess that could make sense for sub-Saharan Africa, given low Internet connectivity; but it's surprising that it also holds for the northern parts.)