TikTok is a complete black box, no one has any idea how any of it works, so it's easier to pretend everything is fine if no one knows what's happening. They could be over-moderating and erring on the side of having more false negatives, and no one would know.

Also, I wouldn't really say so, there are plenty of stories about the algorithm serving harmful content to kids. But again since each person has a different FYP, it's hard to tell. Just because you don't fall into a bad rabbit hole doesn't mean some kid out there won't.

Not sure what makes a big tech company great being totally American controlled. If TikTok is managed well it could be the same with Twitter.