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They get their results from 400+ sources [1] [2]. Bing does happen to be one of them, though.

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

The major advantage DDG has is that it doesn't matter what it is behind the scenes. They can change whenever it suits them and the site will continue to act as an anonymizing front-end, complete with some useful extras.

That's an advantage for them but it doesn't seem like an advantage to me as the user. If they change their sources behind the scenes, what I get as a user would probably change drastically.

Google was great originally because their results were not just different and better but also reliable. If the back end changes without my knowledge that gets rid of the reliability aspect.

So what you're saying is that instead of Bing they could be using Yandex, Baidu or Google?

In fact I think they do use Yandex as well as Bing, at least they did the last time I looked.

This. I find DDG is the vim of search engines. Small learning curve but immensely powerful.

There's always Gigablast (gigablast.com)! And it'd be sweet if YaCy (yacy.net) took off.