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DuckDuckGo says otherwise [1] and the founder explains their Bing use [2] on their forum [3].

[1] https://duck.co/help/results/sources

[3] https://duck.co/forum/thread/4350/did-you-know-that-duckduck...

I'll note that both of those forum links are from 8 years ago and may not entirely reflect current practice. Their "Sources" page also notes their own crawler the DuckDuckBot, and references connections with more specialized searches like Yelp and Stack Overflow.

Just to give a bit of context, that forum discussion was 8 months before Snapchat was founded and 6 months before Google bought Motorola Mobility (which split off just before the thread in question).

Your first link basically confirms it.

> We also of course have more traditional links in the search results, which we also source from a variety of partners, including Oath (formerly Yahoo) and Bing.

All organic links are sourced from Oath and Bing. The other 400 sources (and their crawler) are only used for widget style stuff.

> variety of partners, including Oath (formerly Yahoo) and Bing.

They use Bing. That's something else than:

> DuckDuckGo is really Bing under the covers [...]

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