I dare to guess that TikTok's secret is their objective: they want to know what's on your mind and they want to foresee your thoughts and actions. The end goal, I believe, is a database of comprehensive personality profiles on the american youth, so by the time they become adults, CCP will have profiles on them. Those profiles will be so accurate that TikTok will know you better than you know yourself. TikTok's doesn…
TikTok shows ads constantly. They know less about you than Google but are well placed to show sponsored content and ads, to the extent that every 5-10 videos is an ad or sponsored content.
It's a money printing machine.