Don't make excuses for employees demanding their megacorp do censorship. This should be unacceptable behaviour contract or no.
That's within their right of free speech, and Joe Rogan has equal free speech rights to make counter-demands. You believe in free speech don't you?
I'm saying their ideology is unacceptable (anyone calling for censorship should be shunned), not the fact they're speaking their mind.
It should be noted that union organizing activities are protected in the US from employer retaliation.