Not being able to openly criticize the US or any other government on social media is hardly important. Free speech never existed on privately run platforms to begin with. It's delusional to think that it does or to demand it, when all users must abide with specific terms and conditions. The only people who think that are those whose views happen to align with the views of companies that run the platform. The moment that changes, as we've seen from the Twitter takeover, the previous user base will denounce censorship and deplatforming, while a new user base will celebrate "free speech". It's all a circus of ignorance and disinformation.

The main problem is that allowing foreign propaganda from a political rival to influence your citizens, while giving them free reign to exploit user data, is undeniably a matter of national security. The issue is that taking over a single platform doesn't stop foreign influence and data mining, which is also happening on all other platforms, courtesy of the adtech machinery that powers all of them. We have concrete evidence of this from the Cambridge Analytica leak, which was just the tip of the iceberg of a multi-billion dollar industry.

So unless US companies are willing to take a severe hit on their revenue and drastically change their business models, which can only happen with regulation that in practice will never be enacted, none of this will change.

If you're a user of these platforms, stop worrying about what you can or cannot say, and start worrying about what you're being manipulated to think, say, and do.