Note: From the time since I originally posted this link, DuckDuckGo has clarified the status of search filters, and the article has been revised to reflect that. Thus, I’ve edited the Wayback Machine link to show the revised article. I apologize for any confusion, and I hope this clears things up!
This makes 0 sense. They literally removed the features that makes a search engine most useful. Whoever came up with this change has a terminal case of brainworms.