You’re talking past the other guys point. We all agree that the CCP sucks, but just going after tiktok doesn’t solve the problem when they can just buy user data from a broker. You need to go after all surveillance adtech if you want to keep entities like the CCP from buying that data anyway.
Tiktok isn’t special here, just about every online advertiser will run whatever campaign you want as long as you pay their prices so you have to go after all of them to resolve the issue. Tiktok has CPC ties, yes, but they’re just the tip of the iceberg if you’re serious about the national security risk of adtech.
Edit: if you really want to go after manipulation of public sentiment you’ll also need to mandate disclosure and auditing of social media feed and advertising algorithms to a regulatory agency with extremely heavy fines (say X million $/day) for violators. That’s about the only way you can actually stop the sort of behavior the CCP is engaging in on tiktok.
Adtech itself is an entirely bigger ball of wax, if you want to reduce adtech’s social influence you’re going to have to take ownership of private user data out of the hands of advertisers and give it back to people themselves.