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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.
Eh, when Microsoft was required to ask you which browser you wanted, they didn't need to offer every browser, just theirs, firefox and Chrome.
This could definitely be collusion, but I don't think that not extending it to all competitiors is what makes it that.
Microsoft didn't make the other browsers pay for the privilege of being a browser though.