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It is Bing, but they seem to use different ranking and filtering on the index.vIf you make complex queries it is quite obvious. Since they have zero transparency the details of their system and deal with bing is unclear.

Between geotargeting and A/B testing and possible differences between the Bing API and public website you really can't conclude that DDG is not just what they get from Bing based on one example.

Did you try in incognito? Your search gave me nearly identical results.

Very different ones here.