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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.
"Monopoly - (economics) a market in which there are many buyers but only one seller"
Certainly a practical monopoly, if not a literal one. I would bet 99.9% of all app installs on android are through the Play Store.
I'm comfortable installing apks and even I probably only have 3 or 4 vs the 50 or 60 play store apps on my phone.