It is the kind of answer technology start-ups trot out all the time as a coquettish code for “come and buy us!” - but Weinberg seems sincere. Besides, if he is trying to flog the company, he isn’t going about it very well. Asked how much DuckDuckGo is worth, he says: “I honestly don’t think we’re that valuable, at least until we have more users.” The company does not disclose its finances, although it is understood to be profitable.