From an article at NPR about what might happen to TikTok when the law goes into effect:

It’s also possible that users will be able to access the app but it may be buggy, operate slowly or crash often, the TikTok official said.

Buggy and crash? I guess it’s possible that if some backend services were shut down it could cause problems for the app. Sounds more like made up nonsense, though, as TikTok scrambles to figure out what to do because they only had literal years notice this might happen.