TikTok already limits minimum user age to 13, along the same lines as every other major social media platform which are all shamelessly stealing the same idea for short format videos provided via tailored algorithms. Picking on TikTok while ignoring every other platform doing the same thing simply screams ulterior motivation.
Every generation needs its ultimately inconsequential moral panic after all. TikTok merely got picked out because its background allows easy fingerpointing thanks to a few shifting political trends in the late 2010's.