Why is DuckDuckGo a lousy search engine? Because it uses an API key from Bing.com They pay Bing to use their API key. why would I use DuckDuckGo when I can use Bing. DuckDuckGo use to be the best search engine in the world it was better than Google and Bing.com and Yahoo but any search engine is better than Google. DuckDuckGo says they do not track you online but fails to tell you that Bing does