I mean, I feel it's a misunderstanding of what users actually use social media for.

Just of top of your head, can you list three reasons they want to join the Fediverse for a "normal" Reddit user? Because I struggle to name one, nevermind three. There's all the technical reasons, ethical stuff, etc. But that's all something that enthusiasts would consider, and it goes against how the vast vast majority of users use social media where the more centralized the better as it multiplicatively expands the pool of content and interactions to have everyone centralized.

The Fediverse shows this, in fact! Note how resistant users are to spread over instances, in fact being always after centralizing on the bigger ones. But this isn't a bad thing really, as it's simply the nature of social media. Of course far less necessary on federated stuff, but there's also no reason not to (again, from the perspective of someone wanting to use social media, not advocate).

It's not an easy thing to do to get users here. The place inherently doesn't appeal to those it would need to appeal to.