The concern is exactly that such evidence might be much harder to find for TikTok. Cambridge Analytica's clients included multiple prominent American politician

The concern is exactly that such evidence might be much harder to find for TikTok. Cambridge Analytica's clients included multiple prominent American politicians, including the sitting president at the time the scandal broke. China would try their hardest to stop a scandal involving Xi Jinping from breaking in the first place, and certainly the People's Congress wouldn't demand a public investigation as the US Congress did.