[mod] disable ddg by default - it just proxies yahoo/bing results: https://duck.co/help/company/yahoo-partnership

searx/settings.yml

   - name : duckduckgo
     engine : duckduckgo
     shortcut : ddg
+    disabled : True
 
 # api-key required: http://www.faroo.com/hp/api/api.html#key
 #  - name : faroo