Not necessarily - I would imagine many searches directly using Bing would return some form of "personalization" extending past the search terms itself. Duckduck

Not necessarily - I would imagine many searches directly using Bing would return some form of "personalization" extending past the search terms itself. Duckduckgo claims not to consider this AFAIK. Although maybe the same supposed benefits of a search based purely on query could be achieved by a Bing or Google search without cookies.