Here is something ironic. I bet you many of DDG's users are hackers who use it for privacy reasons. The same hackers who rely on Google Analytics in their own websites. If DuckDuckGo grows to become more than a niche search engine, the same hackers who use it will have to reinvent Analytics somehow. This is reason #1 why DDG will stay small. Reason #2 is that if necessary, a DuckDuckGoogle can be created in an afternoon's worth of effort in Mountain View.