It's probably not a good idea to let a 12 year old use tiktok.
I consider the Chinese oversight a plus. It’s much more sensitive to Asian values for the most part.
If it had values your 12yo wouldn’t be on it as Douyin has an age restriction of 18+, and prenatal consent if 13-17. Under 13 is prohibited. It also has time restriction of 40 minutes per day for 13-14yo and only accessible between 6am till 10pm. Not only that content is highly censored and restricted.
But keep living in a bubble that TikTok is totally fine.
I don't think that means what you think it does.