I suspect the nature of things just leads to that even if they have multiple big upstreams. If bing offers up the best results most of the time DDG will, as a

I suspect the nature of things just leads to that even if they have multiple big upstreams. If bing offers up the best results most of the time DDG will, as a result, offer up bing results most of the time. "Best results" easily determinable even with DDG privacy constraints. They're definitely doing some cool stuff at DDG and its certainly a hell of a lot more than "a wrapper around bing." I just don't think expanding their own index infrastructure is something feasible for them right now.