Specifically, how, where, when and by whom did CNN, MSNBC, ABC, and CBS claim to be neutral? All of these networks are shown as left of center on various bias charts, just as FOX is shown right of center. This suggests that all of them and not just FOX have a 'known' bias.
https://www.allsides.com/media-bias/media-bias-chart
https://www.allsides.com/blog/announcing-allsides-media-bias-chart-version-102-new-ratings-realclearpolitics-cnbc-and-more?utm_source=homepage&utm_medium=Banner-main&utm_campaign=general_071625_biaschart10.2&utm_content=blogpost_launchblog
All people are biased regardless of whether they think they are or not. That is human nature. Journalists are biased. Media caters to its audiences’ biases.
"Can something that is created by biased humans still be useful and trustworthy?
YES, otherwise nothing would be useful or trustworthy. Things created by biased humans are just useful and trustworthy to different degrees."
The chart is measuring major networks vs fledgling websites, and giving them equal weight. Each one counts as "one". Nothing about audience size, reach, popularity, etc......the Washington Times offsets the one of the AP, the CBS News, CNN, The New Yorker or the NYT?
Think back to 2016 when this shit started getting exposed. Regular people were not looking at the NYT, ABC, NBC, etc as propagandist arms of the left. Now, of course, they've been exposed, and smart people know the deal.
Yes, more conservative sites have emerged, but they had nowhere near the audience, or the trust that the major networks used to have.