Solve the problem of people posting this to social media and it won't matter if the company is US owned and operated or foreign owned and operated because neither will have anything to work with.
If you aren't posting top secret data, you also aren't sharing it with enemies on accident.
If the app is made by an adversary, you don't need to post it publicly for there to be a problem. The app has the ability to send it directly without you even knowing.
In that respect, whether it's TikTok or any other social media makes little difference. If it's use of apps like that is prohibited, then it's either not a problem or it's a personnel following policy problem.
That said, if people really think TikTok is a problem they should be worried about some other app that's ties are far less known that might get far less public scrutiny and do far more. By the time we're nitpicking which specific social media platform is the worst to have posted to in this case, we're so far down the path of problematic behavior that we're in absurdist territory. The fact that someone's walking around with the equivalent of a video camera taking movies of what appears to be top secret material is the problem, and whether they put it up on TikTok or YouTube, or sell to the Washington Post or to RT is just bikeshedding mostly irrelevant details.
The solution to this all is probably along the lines of "don't allow smartphones in secure areas" or only allow smartphones that have been vetted by security.
https://www.popularmechanics.com/technology/apps/a15912407/s...
The app needs to be open and in the foreground for it to take photos. On Android at least.
My point is, the problem is posting to social media, or using a device that's insecure. There's plenty of apps that a user could be tricked into installed that are much worse than TikTok and that will have much less public scrutiny.
That TikTok is affiliated with the China in some way is a red herring. There's no reason to solve the problem of TikTok if you solve the general problem of people using unapproved applications (which all social media would obviously be unapproved in secure areas) or insecure devices.
Otherwise what you'll find is that Facebook as some Cambridge Analytica type situation going on, and some Chinese shell company ends up using it to get special access and details, and the same thing as this happens through Facebook and China has special additional info and "TikTok fix" helped solve exactly nothing.
Bringing up that TikTok is associated with China in the article is useful in showing people some of the ramifications of the problem. Focusing on that as the problem leads people to think banning TikTok is the answer, when it clearly is not, since it doesn't go nearly far enough in combating the problem.
https://www.theguardian.com/world/2018/jan/28/fitness-tracki...
Removes certificate pinning from apk files for mitm inspection.