Find actual abuses by the application or its data and then there are credible arguments. Simply alluding to some notion of evil-by-association is a dangerous game for the US to play given PRISM, FISA warrants, etc.
And let's be real -- you're typing on your made in China computer full of components made in China, your data traversing made in china routers and relays, etc. This never had anything to do with any imagined security risk, and had to do with the corrupt manchild targeting a platform for carrying content unfavorable to him. It is just another demonstration that the US doesn't "stand for" much [1].
[1] - The only saving grace right now is effectively the so called "Deep State". The career judges and civil servants who don't twist every norm and rule and precedent because of this corrupt tinpot dictator and his pathetic army of deplorables. They may not be enough, though.