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3000 are many people, I believe that not even google has all those people working on Android.

It's not a lot if most of them will be working on apps to get the infrastructure competitive.

Here's their competition:

Google Play/Android is estimated to have 800,000 apps (Jan. 4, 2013)

Apple iOS App Store recently reported 775,000 apps (Jan. 7, 2013)

Windows Phone Marketplace is up to 125,000 apps (Oct. 25, 2012)

Blackberry World is now up to 70,000 apps (Jan. 30, 2013)