Duckduckgo does not only source from Bing.They use sources from everyone but Google and they have their own web crawlers and an index of their own. Their results feel considerably more relevant to me than whatever Bing is doing. '

Have a look here for more infos: https://duckduckgo.com/duckduckgo-help-pages/results/news-rankings

In some cases I still feel like Google has an edge but those cases become less frequent.