DDG does A/B testing and other questionable things that do not get disclosed transparently to the user: <a href="https://help.duckduckgo.com/duckduckgo-help-pages/privacy/atb/" rel="nofollow">https://help.duckduckgo.com/duckduckgo-help-pages/privacy/at...</a>. I think I'll stick to Searx.