That’s ridiculous. It’s not allowed because it’s not a primary source of information. It’s a great jumping off point for knowledge and if you need to cite something you can just look through its sources at the bottom of each page.

Maybe I just am using it wrong, but DDG consistently gives me completely irrelevant results, while Google still gives me what I’m looking for about 70% of the time. Maybe I just need to learn the proper way to search with DDG but so far it’s been next to useless in finding me relevant info.