Snowden is sort of an unusual standard to apply for this sort of thing? Espionage and intelligence almost never meets a certain level of proof that's available to the public eye.

I'm not really sure what to make of Chinese government involvement with TikTok but from the information available, it seems like whatever it is, TikTok isn't being forthright about it.

You can distrust the US government and also think there's reasonable evidence the Chinese government has access to TikTok for domestic or foreign intelligence.