You're question isn't relevant. America has a more permissive regulatory environment because we believe in freedom. A company can be a natsec threat without violating regulations and saying "but they didn't break any rules" is not a strong rebuttal to "maybe we should make rules to stop shady behavior at the behest of hostile foreigners". Are you arguing this is not possible?
tik tok in America should be run by an entity with no chinese control. the china company should be required to enter into a joint venture with an American tech company but can keep a profits interest. it must share all IP. kinda like y'all chinese do to us already. make sure the communists have no control over what Americans see.