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A Jury Will Decide If Google's App Store Is an Unjust Monopoly
(www.wired.com)
This is a most excellent place for technology news and articles.
It's a monopsony - a monopoly from the other side.
Google Play Store is not the single seller of apps to users but a single sensible buyer from developers. Of course with most apps being free of change, "buyer" and "seller" are loose terms to satisfy the definition.
It's both really.
As an app developer it's a monopsony.
As an app user its a monopoly.