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Not a valid comparison since those are core products of both companies. Google hasn't and never will open source Search.

Android is one of Google's core products, as well as web (including Chromium).

chromium is open source because webkit (khtml) was open source

many useful parts of android are closed, and open source versions of most apps are languishing (calendar, contacts, dialer etc)

Have you checked out F-Droid lately, and how does this compare to Apple or Microsoft?