The 1st Amendment does not apply to Chinese companies operating in the US.
And even if it did it isn't a suicide pact that forces the US to do very stupid things like let the CCP use TikTok to manipulate US citizens to the benefit of the CCP and detriment of the US.
The first amendment applies to the communication of US citizens. If TikTok is found to be unlawful for non-free speech reasons and its distribution is outlawed, 1) Americans can still use it for communication and 2) Americans can use any number of other things for communication.
It wasn’t even the manipulation that was the NatSec concern, it was the amount of sensitive data they were pulling of not just TikTok users but any friends or family of theirs that they had in their contacts. This means they have data on people who work in sensitive departments, military bases, etc. and they had already been established as providing that data up to the Chinese Government. It’s the same reason India banned it, it was being used as an espionage tool.
Now the other problem is that Meta will sell much of the same data to anyone who is buying. We need to do something about surveillance capitalism from private industry too.
And even if it did it isn't a suicide pact that forces the US to do very stupid things like let the CCP use TikTok to manipulate US citizens to the benefit of the CCP and detriment of the US.