Does everything have to be about mainstream audience? I don't know if DDG's goal is to take over Google's market share, but I can say that, as a (wannabe) hacker, I've been using it as my default search engine for the past year or so.

What seduced me was the reasons stated by my grandparent comment (and the fact that good ol' Google search is a "!g" away).

Not everything has to please the mainstream. Discussing whether DuckDuckGo is a good name is one thing. But to questions the features of the engine on account that it's not "mainstream" misses the point. I think.