people have no idea exactly how much linux they are running now -- it's invisible. It's in TVs, DVRs, routers, cable modems, tablets, phones, etc. People just don't realize or understand they have linux already running in all sorts of gadgetry in their homes and offices. People don't notice because in these embedded applications, you don't see it at all.
Google is trying to get their brand "ChromeOS" appreciated -- they don't want to confuse the marketplace. Everybody who understands knows it's linux under the hood, same as for Android, ddWRT, etc.
This is really a very silly argument. 50 lashes for the editors.