> Why wait until TikTok breaks the law to ban them?
Why wait until a homeless guy steals some bread to throw him in jail?
The foundation of the rule of law is that the law applies to everyone equally, not arbitrarily. That includes a presumption of no wrongdoing and due process.
It should be mentioned that TikTok already has its full US data and source code audited by Oracle, a level of scrutiny higher than any of the domestic tech companies. Combined with the FBI and NSA watching them like a hawk, if they were breaking the law, it would be old news by now.