It's reasonable for governments that don't entertain the notion that their citizens have freedoms of association, speech, etc. For countries where those concepts are legally enshrined in the country's own founding documents, no, it's not. Part of living in a democracy is having the responsibility to inform yourself and make voting decisions based on your own understanding. Letting the government tell people who they can and cannot listen to flies in the face of the very idea of democracy.
But that's not what this is doing.
People are still free to hear the same thing on other platforms (which they can considering how much is crossposted).
It's like getting rid of AM radio because you want to use the spectrum and claiming it violates freedom of speech because stations have to close down.
And anyone is free to fly to China and have conversations.
Or read the state-run media from China.
These free speech arguments seem to have the prior that TicTok is literally the only communications channel.