It uses many different sources to get it's information. Bing is probably one of them, yes. What is it, that makes you feel you can't take it seriously? It does in fact do what it says on the tin, which is letting you search in an +- anonymous way.
Edit: It is through tracking that Google gets results that some people see as being superiour to those of DuckDuckGo: Google's model of you makes them think that they know what you want to see, and they give you those pages.