That search bubble effect is part of the reason I switched to DDG. I have no interest in being stuck in a single echo-chamber. My searches cross-over many domains and interests.

Also, the first result for unzip in DDG is winzip, followed by 7zip. It' not as ambiguous as you think, since almost nobody is curious for the general definition of a semi-common word.

Also, Google keeps me in a Canada bubble which I also dislike.