From first principles reasoning, this is a good idea. We don’t ban Chinese websites, books or products. Although we tax their products more now. Apps aren’t like physical commodities. They can be used to gather data, quite invasively, shape and form public opinion in a new and more visceral way, as well as take advantage of exploits. Admittedly websites can do that too, but the scale of adoption of Tiktok makes this…
What about if all non-US countries start reasoning like you and ban Youtube, Facebook, ...?