I've heard this in other discussions of DuckDuckGo here, and I don't understand why bing/yahoo allow a potential competitor free access to data that is so important to their search businesses. What's in it for Yahoo/Microsoft? Or is DDG paying for the privilege?
"We are exploring a potential fee-based structure as well as ad-revenue models that will enable BOSS developers to monetize their offerings. When we roll out these changes, BOSS will no longer be a free service to developers."
I don't think the ordering of the results is Google's competitive advantage anymore it's branding and habit.