Maybe so, but I don't agree with them. What they're doing is using their state monopoly on force to squash dissent. That's reprehensible, and entirely separate from companies deciding what content they want to endorse through re-broadcast.
I'd be genuinely curious to hear what people think is the difference between "deplatforming" a screaming racist in my living room by telling them to leave, and removing someone's account from a website I built. It seems to me like both are not only well within my rights, but the correct thing to do.