"Their own platforms" is the flaw. Countries and companies shouldn't "own" the means of mass communication to begin with.

How the feed is filtered should be a fungible commodity that anyone can swap out for themselves or offer to others without sacrificing the network effect, because the network itself shouldn't be owned.

Notice that the US doesn't censor bbc.co.uk, because the web is a decentralized system. But then ordinary people end up on Facebook or TikTok, which isn't.