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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.
Chinese Android phones came bundled with third-party app store. Huawei, after US embargo, still has strong presence in Asia even without Google Play Store. Xiaomi has GetApp, Samsung has, too.
Apple, on the other hand, would not let you sideload apps.