I know no one who consciously uses it to do anything other than my mother who uses it search for Google.
If none of the other default integrations exist it'd be dead on it's arse.
From what I've heard their video search is superior.
> Although why anybody has to actively /search/ for porn is beyond me.
Specific tastes?
Plus Bing has nice background images (I use it as my homepage).
I like DDG, and use it, but it's mostly a pretty front end on a now-deprecated Bing API. If Bing shut down, DDG wouldn't be far behind.
I've never seen a DDG crawler in any of my logs, though I've seen plenty of Google and Bing (and others). DDG does some nice instant answer and bang stuff, but the actual deep search results are all Bing (and maybe Yandex?)
The DDG crawler is not used for organic results, only for stuff like the widgets. All organic results are from Bing and Yahoo (and possibly Yandex).