Maybe there's child accounts that has those limits, but normal accounts don't match that description. I've watched my girlfriend use Douyin and the content was lower brow than what e.g. Instagram shows her. It was mostly dumb skits and people doing silly dances. Due to time zones, I have no clue if it shut down at night, but it never seemed to be an issue.

We get a lot of propaganda about Chinese social media apps that's just wrong. I was told Xiaohongshu is a propaganda app that sends quotes from Mao's little red book, and it's Chinese Instagram.