Because:
The fascist oligarchy will carry out it threats, steal their money, and throw them off the air ANYWAY!
Would you put your job on the line to make an accusation that you really can’t prove?
I think they know the score but see their first obligation to the people who sign their paychecks. Their employers don’t want it discussed, so they can either play ball or re-start their careers. That in the knowledge that Zero could at anythime produce a valid BC, though as time goes on that likelihood has diminished to almost nil.