They rank based on relevancy. Domains that are found misleading readers often are less relevant than domains that are misleading readers less often. That's it.

They rank based on relevancy. Domains that are found misleading readers often are less relevant than domains that are misleading readers less often. That's it. All search engines have to make these calls all the time, and I see no viable alternative approach that would be better. There is no 'natural' ordering of the web...it's all judgment. If you think DDG's results are less relevant than those you get elsewhere, use the better engine!