But blocking political sites you don't agree with? I don't get it, it's not like they are polluting my search results.
There's "don't agree with" and there's "website is known for spamming false information". Fox, breibart and daily mail all fall into the second category, whether you agree with their political ideas or not.
Edit: I wanted to link the original "things that cause and prevent cancer" list page, but it's not online anymore unfortunately https://web.archive.org/web/20140807144235/http://kill-or-cu...
You don't go there for news. You go there for your daily set of outrage and panic.
I would def not consider sites like dailymail.co.uk a good source of information.
Other than that there is also a chance that certain websites have a high hit rate because of the words used in the articles or the amount of articles put out. If certain publications clutter your results they are likely to get banned.
Of course, Fox News has made the legal argument that people shouldn't believe what they say (https://www.npr.org/2020/09/29/917747123/you-literally-cant-...), so it's not surprising that people paying for a service to look for actual information would block them.
https://www.bizpacreview.com/2019/12/28/rachel-maddows-defen...
I interpret that as a skew.