What's to stop TikTok from serving their website from non-US servers to all comers? Using it in a browser is not as smooth as an app, but there must be apps out there that are nothing but a WebView to URLs on a single domain (like you can do in Mac Safari with File... Add to Dock...). Submitting / watching videos wouldn't be that different.
It seems to me the only recourse the US would have is building The Great Firewall of America.
It seems to me the only recourse the US would have is building The Great Firewall of America.