Following people isn't that interesting since most content creators that hit it big are One Hit Wonders. After they hit that big growth spike, they either follow the herd with the latest dance or trend, or they keep doing the same thing that made em famous with slight variations.
How long can you milk the same dance routine by switching out which celebrity does the silly little dance?
There were a few interesting educational channels for a while, but most people just don't have that many interesting things to keep posting about at the rate which is expected of a platform like TikTok. Quality content takes time to produce.
TikTok really only has a few buckets of content types. Some examples include thirst traps from sex workers that are looking to promote their OnlyFans and cute animals doing cute things.
Instagram isn't that different. I mostly use the app to see cute pictures of people's pets and the occasional human picture.