Sorry, not all of them are. The Guardian in London is owned by the Scott Foundation and has complete editorial freedom. The funds ran out a few years ago, and now it operates on donations.

There are many other news sources as well. I read news sources from about a dozen different countries, and it's easy to see when something doesn't add up. And, yes, all of them are mainsream. I don't trust anything that is not mainstream. They don't have the resources to get the full story.