What would give them standing? They'd have to be an entity protected by the constitution to claim that protection was harmed. Is it this (Wikipedia)?
TikTok Ltd was incorporated in the Cayman Islands and is based in both Singapore and Los Angeles. source
I guess I've never thought about what makes an entity have rights here. Buckingham Palace couldn't just open shop here and start suing our government, right?
At this point, I'd like to ask: If a foreign company threatens democracy in a country, is it legal for the executive to ban business with that company?
No? Then that doesn't make sense. It's a FOREIGN company, the government should have the right to do whatever it needs to protect its citizens in that regard.
The ironic thing is that if the US government wanted people to stop using it because of the PRC, they should have just leaked some fake Snowden style documents saying that the NSA was using it. Everyone would drop it like a hot potato then.