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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.
While sure, there is leverage, but it's not like Spotify is being arbitrary about their content. I can listen to obscure stuff, and I do. Also don't forget that big artists are often big for a reason and it's usually not for a lack of talent, taste just varies but certainly there always is a market for 'pop music'.