It's the concept of the "Purple Cow".

If you look into a field of cows, the purple one will always get the most attention. If it's new enough and weird enough, it will get attention and make money.

There will always be a profitable purple cow in the world. And these purple cows will continue to get weirder and weirder. Why? Because purple cows make money.

After all, these Tiktok NPC's are simply the latest purple cow, and there are plenty of more to come down the line.