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Google CEO Sundar Pichai Warns Android Users Not to Sideload Apps
(www.gizmochina.com)
This is a most excellent place for technology news and articles.
Recently Android added another scary "malicious" warning to the already numerous scary dialogs if one tries to install F-Droid. The "Install anyways" button also became hidden in the "More details" menu.
It's not just F-Droid, it's any app.