They are not.
They have taken political sides. They obviously favor one political ideology. They spin and shape the news to support their political agenda.
They report and fail to report the same stories. When it comes to the stories and events they report, their coverage is repetative. It doesn't matter which network you watch. They most,y report the same story from the same point of view.
When a particular network or news agency dares to stray from the establishment narrative, the rest attack that network or publication.