You must not be paying attention to all the failures that google releases.

Google dominates email, but waves and even inbox I would say aren't catching on. They are failing in mobile messaging. Even though they own a huge part of your social graph through phone and email, they still can't get social right. Google owns ITA but Google flights is not the first place you look for plane tickets. Google also owns Zagat, but foursquare and yelp still dominate.

I think the argument only looks at the wins and completely ignores everything else.