Fair or not is irrelevant. It’s a private company so they can do so. I don’t agree with silencing people over political beliefs regardless of what they are.
I wonder what would happen if they decided to shadow ban Democrats and people of color, and gays. I bet there would be an upheaval like never seen before by the Democrats. Yes what you said, would still apply to them. Everyone is game, but they put themselves out there as a utility, thats why they can get a away with it.