No, this answer is tired and inaccurate. They successfully fool you into thinking they are much more complex than they really are. They use Bing and Bing alone for the SERP links (without this, you don’t have a search engine) and their crawlers fill in the handful of “onebox” results for certain queries. They keep changing this statement but it used to say “multiple sources like Bing, Yahoo, Oath”... all of which are just Bing. It’s Bing with a couple of add-ons. If Bing were to go away tomorrow, your beloved DDG would be done.