Nobody reading this website will be the least bit surprised by this, but for the wider world, this is a story that has to be told.
Joe Rogan recently hosted Krystal Ball, a former MSNBC host, and Krystal revealed that MSNBC was policing her monologues as far back as 2014 for criticisms of Hillary Clinton.
These cable news hosts are there to be the voice for their management teams. You can't hold real opinions of your own and you can't just deliver straight news. There is a corporate opinion that must be presented as the correct view.
There's a reason Donald Trump called the network MSDNC. Because that's exactly what they are: The mouthpiece for the Democrat Party.
People like Krystal know this. If you step out of line you aren't going to be employed long.
People know where the boundaries are, they know what they're allowed to say, and so they don't need that direct intervention or censorship. And also, by the way, these people most of them in cable news, they're not really there cause they're talented. They're there because they're reliable purveyors of whatever it is that that network wants to purvey.