Is there any reason to think that positivity will continue to hold? Or is TikTok just getting its grace period before griefers, trolls, and paranoiacs move in?

If the Chinese government is going to aggressively moderate TikTok to keep that out... uh, cool, I guess. I'd be happy to see some popular entertainment that doesn't devolve into a screaming match. But it's a lot of work, and reduces audience (i.e. revenue).