The ban on a communications platform effectively censors people's speech.
Actually, that would be considered a “time, place, and manner” restriction, which has been specifically ruled to be not a violation of the First Amendment.
Interesting. But the time here is basically "indefinitely", the place one that affects 150m+ people, and the manner the most draconian possible. Not a lawyer, but that seems like overreach to me.
I'd say it's more banning of specific communication platform like radio station since other similar type services could be developed and we have already seen attempts with IG reels and YouTube Shorts.
Also, censorship has been allowed by courts time and time again if it's narrow focused to satisfy compelling government interest and not overly broad.