I just repeated your experiment: With my ad blocker disabled, I searched for "google chrome" on DDG. I got two ads above the search results; one was for google.com, and the second was for downloadsem.com, which is distributing a Chrome browser that comes with a lot of browser toolbars. I took screen shots. [1]
Of note is that these ads are powered by, and clicks redirect through, Yahoo.
No, are you trolling? I was hardly the only one on this post who didn't get ads for that search. You are the first person to mention the mobile version of any browser so I did the same search with Chrome on Android using DDG and... Gee, the Google Chrome website is still the first result. The only time I got an ad was with the Canadian version of Bing. Note, I am using the DDG website NOT the app or extension.