Lots of responses about 'I only see funny comedians' or 'Tik Tok is only about dumb entertaining videos', etc.
This misses the forest through the trees. The dumb videos are the mechanism through which a foreign and often hostile world power is able to create a profile on millions of americans and learn everything about them.
All this data is fed back into other Chinese government groups and organizations which leverage it to determine how to best spread divisiveness, propaganda, misinformation and more through all the other platforms (FB, Twitter, News, etc).
The funny videos is the honey pot trap to collect all the data to create profiles, it may or may not be the primary way the Chinese government then uses that information to influence or nudge people but it informs and empowers all of that.
Also, TikTok's algorithm is specific and targeted. Just because your feed is only funny videos doesn't mean everyone else's are too. Even if everyone in your 'group' sees the same funny videos, there are many other groups that have entirely different feeds and many other variants.
This has nothing to do with free speech, no one is saying you can't say this but not that on TikTok. This is about the existence and allowance of it in the first place. Plenty of other forums for the speech.
I wonder how people would react to this issue if TikTok had come from Iran or North Korea rather than China.