I'm not sure DDG can actually do much to improve search results with the way they operate. They aren't a first class search engine, they get results from other search engines.
Perform a search on DDG, then do the same search on Bing. You'll notice the first results are the same.
In order for search results to get better on DDG, they first need to get better on their partner search engines (which I believe Bing is the main) so as far as I can tell it's out of their control.
Perform a search on DDG, then do the same search on Bing. You'll notice the first results are the same.
In order for search results to get better on DDG, they first need to get better on their partner search engines (which I believe Bing is the main) so as far as I can tell it's out of their control.