Is there any evidence this search is tied to you / your browser / a cookie? Tracking links is not necessarily tracking people, violating privacy, etc. I'm not

Is there any evidence this search is tied to you / your browser / a cookie? Tracking links is not necessarily tracking people, violating privacy, etc. I'm not necessarily defending DDG. I just want to ensure that if we're going to feel that our privacy is being violated, it actually is.