Just for kicks I searched for 'search engine' on Google - once on Chrome(logged into my Google account), and once on Firefox(not logged in). Didn't get Google on the first page on either searche, did get google custom search engine though(which is a completely different thing). Duck Duck Go was in the first page both the times, as were Bing, Yahoo, some engine called Dogpile(never heard of 'em but it was #2 on Chrome), the Wikipedia article for Web search engine and a few other links. There was a list of popular search engines at the bottom of the page in Chrome, DDG wasn't there, but lots other were, and it was compiled from other sources.

Don't see much discrimination there. Especially when they don't even list their search engine on the first page

Chrome search screenie - http://goo.gl/HffYt Firefox search screenie - http://goo.gl/nUe7t