That could be solved by allowing users to filter by score or number of comments.
30 million tiktoks are posted by day. What do you mean your are going to allow "users to filter". This "regulation" will be trivially defeated by TikTok-Videos LLC uploading videos and TikTok-DataScience, providing the most popular filtering algo.
At the end of the day, many children will simply default to using the best algorithm, and all this regulation helps no one.
Just like with GDPR, the tech giants will put their foot on the scale and continue to operate how they fit, and the smaller guys will die under a thousand paper cuts. I'd rather not add more regulation that cements Meta as the sole media platform of the internet.