It is Bing, but they seem to use different ranking and filtering on the index.vI...

mda on April 16, 2022 | parent | context | favorite | on: DuckDuckGo Removes Pirate Sites and YouTube-DL fro...

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.