The first two don't apply because they don't share the hyper personalized nature of social media. No two people see the same thing so it's impossible to react to foreign propaganda. Books and movies don't work that way.
Third example is irrelevant because it's impossible to achieve the efficiency (reach) that social media has.
Since when are social media apps considered broadcasters? In fact, section 230 legally protects social media apps from the civil liabilities of broadcasting. You're also just distracting from the actual issue. Being that, as citizens of a democratic republic promoting free speech, press, association, etc., do you think we have a right to view foreign media (including broadcasts for that matter)?
I don't really see your point. Tiktok is a video library. With the exception of private videos, anything hosted on the app can be viewed by anyone. Whether or not the app provides a personalized algorithmic selection of videos does not have any bearing on the more fundamental question of whether American's have the right to access foreign media.