Watson needs to at least start off with a large curated dataset. Without that it would be very vulnerable to the inevitable influx of spam.<p>Spam and content farms are a big problem for Google, because of the market share it's in a spot where it can't curate content.<p>Watson tech would be best applied to specific domains, like Wolfram Alpha, which hasn't exploded in popularity. People prefer one good enough search destination for simplicity, Google's calculator is good enough for those searches.