Are you sure?
Cookies and other technologies of tracking only help improve relevance of
search queries, because of personalization. But even without personalization
, filter bubble is possible.
Just imagine the situation:
You are learning biology. You are found hard question in the textbook and
decided to find right answer from author of the textbook. Because of this,
you are googled. Google found relevant answer and you keep it in mind.
But you don't even suspect that there is another perspective on the same
issue.
Somewhere on the Internet is a creationist article on the same subject, for
example. The creationist may be wrong.
But if you read this article, then your knowledge is likely to become deeper,
and you will know weak and obscure places of the theory.