A couple of years ago when two RT reporters quit the network and denounced it as biased, it immediately was picked up by the Western press and broadcast with great zeal and regularity.
Within the past couple of days a FOX news commentator and former military officer stepped aside and denounced the network as being little more than propaganda. In his case, he was hardly some kind of centrist. If anything he's a right-wing figure that has made some pretty outrageous statements in the past. Nevertheless even his tendentious eye and predilection for bellicose rhetoric reached its limits. It's quite a commentary on FOX and what it stands for that he of all people would reach his limit. They are of course downplaying the incident.