The source of results is irrelevant. Pagerank based revenue model and how they prioritize relevancy (e.g.: programming related query will have the top stackoveflow answer on the first page and their bangs) is why I like them in addition to their privacy promises. Ddg is still very simple,especially their /lite search. Google is cluttered and weighty but I still need it for some results. Bing results are often different than ddg for me as well.