Good product loop (positive flywheel):

Everyone loves it → everyone actively maintains/uses/spreads it → everyone makes high-quality creations around it → the product ecosystem keeps improving → attracts more high-quality users and creators → forms a virtuous cycle of positive feedback.
Garbage product loop (negative spiral):
Everyone exploits it (traffic, emotions, short-term profit) → serious creators’ hearts turn cold, they leave, or are forced to compromise → more criticism, content quality declines → it must rely on more “traffic, traffic, traffic” for stronger stimulation → the product gets worse, user experience deteriorates → enters a vicious cycle.