If DDG or Kagi had an index large enough to cover the long tail of the web like Bing and Google do, we'd know about it. They'd have large data centers of their own, not to mention the papers and patents covering all the optimizations necessary to crawl, index and serve that without losing money. Instead, that work is outsourced to Teragoogle and whatever its Bing counterpart is called.

"The web is big. You just won't believe how vastly, hugely, mind-bogglingly big it is."