Are you saying Google doesn't use 3rd party data? Because that would be completely false. Look at the copyright notice in the bottom corner of Google Maps for anywhere outside the US/Canada/UK - around my city the data comes from WhereIs, Sensis, Tele Atlas and GBRMPA as well as Google. Other countries have data from AutoNavi, MapKing, SK M&C, ZENRIN, GISrael, INEGI, and many others.