And for anyone living in North Korea who ever has a chance to read your comment, I'm sorry, this person has no idea what it means to live in a police state under a belligerent dictator.
And the right comes from their Constitutional power to regulate foreign commerce. The US has banned American companies from doing business with various foreign entities for a while, though it really picked up after 1990.
I doubt there were, because it would have been moot: the Soviets were so far behind on computer technology that they didn't really make anything anyone would want.
But more generally, the US was a lot smarter about trade with adversaries during the Cold War. There were significant restrictions on trade with the Communist Bloc that limited the kinds of entanglements we now have with China. The US got really stupid and overconfident after the Cold War ended, and that's only slowly starting to change (and this TikTok "ban" is a welcome part of that).
Being a government. They also get to tell you want kind of guns your allowed to have, what kinds of medicines you can take, and how much gas your car uses, and how your home has to be built.
Welcome to the real world, is this your first time here?
They don't have to.
> The issue is that it’s awfully close to the kind of speech you are “permitted” to be exposed to, which is a slippery slope.
It is not. The so-called "free speech" issue with this ban is bullshit and a red herring.