Not true, Look at chrome, Its mostly leveraging various externally developed pieces of sw, and then adding some sauce (process isolation) into the mix.
Google unlike other companies knows how to leverage open-source for its profit and does it like no other
Vertical integration has led to some of the largest companies in history. It started with Andrew Carnegie and his steel company at the end of the 1800's. It fell out of favor around the 1970's and shifted to a mentality of focus.
