Facebook is likely handing all that biometric data over to the US Government, but at least American's have some say in what the US government does.

We don't have to speculate that TikTok is handing all data over to the CCP, it's a certainty.

American's have zero say in how the CCP conducts itself, even Chinese citizens have effectively zero say in how the CCP conducts itself. So there is a perfectly logical reason why people would be more concerned about the CCP having the data instead of the US Government.