https://help.duckduckgo.com/duckduckgo-help-pages/results/so...
Interpret it as you wish. To me it sounds like they are using 400 sources and their own crawler for the Instant Answers stuff but get all their "traditional links in the search result" from Verizon(?) and Bing.
Well, of course, it can be "much more than that" depending on how you interpret that statement. When I hear marketing blurbs like _"over 400" sources,[15] including Yahoo! Search BOSS, Wolfram Alpha, Bing, Yandex"_ I inevitably start yawning and realize "much more than that" for what is is, marketing that worked on people.
You can run an experiment: would you ever have to be persuaded that for instance Google is much more than just X? Well, no because it's usually proven that it is without someone on the internet having to tell you about it.
Crawling most of the web on a regular basis is incredibly difficult and requires resources that only a company like Google can provide.
Every time the topic of search comes up on HN, someone always jumps in and says this.
Then there are a bunch of other people who jump in and say that Duck is much more than that.
So, which is correct?