Most people on any platform are consumers, and that doesn't seem to decrease as the platform grows. Steam, the app stores, and YouTube are not exceptions.

If it did become a problem, TikTok could change rules so that you must review X clips for every one you post. It wouldn't put off most creators.

The reason user-generated recommendation systems don't last is not because they break down under a flood of content. The reason is that the platform finds it more profitable to promote content based on a different algorithm (whether that is pay to play, sponsored posts, optimise for user engagement/clickbait...).