You say US-controlled, but I can't think of a country that would be better than the US in this regard. European countries are not the biggest fans of free speech. And then you have China, Russia, etc. which are even worse.
Perhaps there will be more than one, then. There will be different ideologies which will be protected and different ones which will be censored on each one of them. In total there might be more freedom of speech.
A teacher in high school told us: to the question "which newspaper should I read?" the answer is "not one single newspaper".
With federated protocols (like Mastodon) you don't need to trust a third party country. All countries can be part of the same universe, but each one controls their own data.
