Come to think of it, perhaps this is their feature which uses previous searches and treats your current search as a continuation of the last one; though I've altered my query the search terms I abandoned get resurrected.
[Edit: confirmed!] I just tried this in relation to another comment I posted. I typed peer to peer lending into Chrome's bar to search for this. A bunch of finance related results came up. I was looking for movie lending, so I altered my search to peer to peer lending movies and looked at the results. Still unsatisfied, I thought that maybe the term borrowing was better than lending. So I changed my search to peer to peer borrowing movies. Lo and behold, the search results show a page full of results with the word lending bolded and no results that show borrowing at all: http://imgur.com/lPPQmxY
If I absolutely didn't want the word lending in the results, I would need to alter the search to peer to peer borrowing -lending movies to avoid this. For development searches where I'm sometimes trying to find a needle in a haystack, I don't want to have to keep excluding numerous terms I have already decided are undesirable. As I never sign in when searching and I can't be bothered to find and change whatever Google setting causes this every time I fire up my browser, I find DDG to work the way I expect and often with better results too.
That said I think the competition DDG has provided the other search providers has been a benefit to me.
Frankly, I think this is morally wrong. When they use an inferior search engine, or inferior maps app for that matter, people are dumber than they might otherwise be. They miss a boost of intelligence, perhaps not IQ, but they are less effective operating in the real world. The world as a whole is worse because of it.
However, you're saying that the only thing (or the best thing) that will make the world better is better quality results. This is wrong. Playing the long game by supporting such search engines means that quality can improve and you end up with both better quality search engines AND morally improved companies. The whole world will be better because of it. You're thinking too short term.
https://duckduckgo.com/?q=barak%20obama&kp=-1&k1=-1
Now, if Google can pull off something similar with heuristics alone they may have an advantage, because those little boxes are run by code covering a whole bunch of special cases, and that could be a bottleneck.
But I love the exploration options of the instant answers.. What Google is doing is definitely more time-sensitive (they're justifiably tooting their own horn a bit with it), but it doesn't feel as useful in the typical case (does anyone really use Google like a newspaper?). If you search something like "barak obama news" on DDG, you get basically the same result as the Google headline summary, and it didn't get in the way of the list on the "barak obama" results page. It feels more natural, to me at least.
"I came for the privacy, but I stayed for the features..."