My pet theory is that Google can afford to dedicate large amounts of resources to stuff like this, simply because there's no real competition to it's core product, which is a combination of search, profiling and advertising.<p>I do however believe that Duck Duck Go is the only viable contender who could realistically take on Google, not because their search is any better or worse (something which can always be tweaked), but because privacy is becoming a hot topic that non-techies are starting to wake up to.<p>I'm also reminded of when Google first started and the amount of developer good-will it received, which I believe had a huge contribution to it's success. I get the feeling Duck Duck Go has the same level of developer good will behind it.<p>As I see it, Google's business model is so wrapped up in profiling and tracking that it will be difficult for them respond to Duck Duck Go if it gains any traction. At that point, Google may see a serious decline in it's core revenue stream, and things like Android may not seem like such a good idea.<p>Anyway, that's just my theory.