For what it's worth, I was only pointing out that a guy transporting 1 gram of heroin would be a
lower priority for investigation compared to a guy transporting a larger quantity of the same product. So a social media platform that's worse but less popular would not be on anyones radar for a ban, precisely
because its on nobodies radar to begin with.
But I see the point you're making. I'd say that, in the case of hemp vs heroin, the guy transporting 1 ton of industrial hemp would be subject to close scrutiny since the product could be used for illicit purposes (turning into heroin). If there was any evidence or suspicion of foul play, his capability to transport industrial hemp would be removed and he would face investigation. I'd apply the same logic to software too.
But the difference is that it's hard to scrutinise closed-source software and it's also difficult to "trace" data and know that data isn't being harvested for re-use by the CCP for other nefarious purposes. We do have suspicion of foul play though – TikTok routinely blocks anything anti-China and we're aware of the massive data gathering that the CCP performs to monitor its own citizens. We also know they (and others) are manipulating western social media using the data they've gathered.
Your subsequent argument that TikTok is just full of people doing stupid things is, I think, a bit disingenuous to the potential for harm that TikTok is capable of. The top level commenters link (https://stratechery.com/2020/the-tiktok-war/) explains it quite well. It's also worth noting that the same argument could be made for any social media platform when they first got started. Example, facebook = "just a bunch of teens socialising online". Obviously if you're one of the people who doesn't think facebook has become a problem then this debate is pointless. But if you do see the harm that facebook has caused globally, I personally believe that TikTok has even greater potential for harm.