Note that the issue is not that TikTok's terms or business model, or even their track record on censorship, are any worse than Alphabet's or Meta's. No, the point of the complaint, the hinge of the whole panic is simply the amount of time kids spend on it.
In other words, TikTok is being punished for doing what they do better than the Americans can manage it. Like Huawei, their basic sin is simply being too good.
That doesn't fit with the usual American narrative of backwards, intellectually stunted Chinese needing to steal all their innovation from the west. And what makes it particularly awkward is that any real, meaningful social defence you create against it - would work just as well, or better, against American social media too.
Naked protectionism is the only weapon the feds dare use against it. And they're not even slightly ashamed to do it.