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Re:Ask HN: Is there room for another search engine? by eatmyshorts on Sunday March 26, 2017 @02:20PM (#13962206)
DuckDuckGo doesn't crawl/index by itself--it partners with other companies to use their search indexing. Bing is one of their primary sources of indexing, actually, although Wikipedia tells me that DDG's indexing is a compilation of "about 50 sources".

https://en.wikipedia.org/wiki/DuckDuckGo

Re:Ask HN: Is there room for another search engine? by mrweasel on Sunday March 26, 2017 @03:10PM (#13962510)
DuckDuckGo do have their own crawler: https://duckduckgo.com/duckduckbot, but they are dependent on the indexes of others.
Re:Ask HN: Is there room for another search engine? by bogomipz on Sunday March 26, 2017 @06:27PM (#13963705)
Interesting, I had no idea. I wonder if they have or ever had plans to index themselves? The wiki link mentions they have do their own crawler.
Re:Ask HN: Is there room for another search engine? by Vinnl on Sunday March 26, 2017 @04:00PM (#13962868)
Yeah but neither do some of the other mentioned search engines. Apparently DDG just is even smaller than I thought.
Re:Ask HN: Is there room for another search engine? by smarx007 on Sunday March 26, 2017 @04:18PM (#13963000)
Ahrefs crawls actually more than any search engine other than Google: https://www.incapsula.com/blog/most-active-good-bots.html

And Bing, Yandex, and Yahoo have active crawlers.