I think people are tired of the 140 character type social networks, the novelty has simply worn off. It's either self-promotion or "I had two eggs for breakfast lol" type of posts.

People who came to Mastodon, posted "Hello world!" and didn't bother to set a profile picture or add a description will always complain about the lack of discoverability, or the place being boring.

You literally have to put in work to set up your feed, follow hashtags, people and post yourself for it to be a network and not just a feed of things. And I think people struggle with this concept a lot.

I do understand that it's not for everyone. But it's not a problem with Mastodon, it's just a natural filter IMO. "You have to put at least this much effort to integrate". Low-effort things are usually just rage-bait.