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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.
My understanding is that they don't split your subscription fee up to the people you listen to. They base it on who all of their subscribers are listening to. So even if you listened to your favorite obscure artists 24/7, they might not get a dime if nobody else is listening. However, a sizeable chunk of your subscription will go to whoever is most popular on the platform even if you didn't listen to them at all.