I can't help but feel like this is just a case of "old man yell at cloud", I don't use it, but isn't it just a bunch of short video? Why ban that and not youtube or "insert other video based social media platform"? It just feel like because it wasn't made in the US they want to ban it. I've heard it collect personal information, but again, hows that any different than any other social media platform?
As far as it being bad for teenager, being a teenager is bad for teenager. They'll always find some way to make their life terrible, that's literally what being a teenager is all about. You could ban literally every piece of electronic in the world and they'd just go outside and slam their head against wall and go back to bullying each other in person (with added bonus of physical beating).