I just found out yesterday that my cousin lets their 5ish year old have a TikTok account, but they have to allow or deny anyone who follows. How absurd is that. It doesn't block anything about what they view (I assume they relied on this safety feature), and there's no way that vetting who can follow (family and friends) is safe enough. The alternative is my younger cousin not having access to TikTok at five years old. Seems like a completely fine alternative.
I imagine the average person just doesn't think about the potential implications of giving your child a TikTok account at that age.