With DNS, it's possible to control key components of Internet navigation. Google already controls search, they are quickly gaining market share to control the browser, and when you put in DNS, it becomes the trifecta of complete navigational control.
If people use Chrome, we make less money on our service and that's fine by us because that is fair competition. I wouldn't put Google on a pedestal for competition, but they aren't telling users not to use OpenDNS.
Google has helped raise the importance of DNS above the network engineering community, which has been really good.