Frankly, this should be a surprise to no one. I bet Instagram is full of that, too, since both platforms are almost identical nowadays.
I remember an article, I think from 2019, that showed how easy it was to find teenagers dancing for whatever those TikTok points are that they could redeem for actual cash. On a few occasions, the journo asked on stream "how old is she?", which got him insta kicked and, on another, the girl desperately tried to claim she was 18