I haven't checked it out personally, but this is my impression of all of the webs that aren't the world wide web. Like the meshtastics, the new freenet, some web 3.0

It being harder to join has the effect of their being a smaller more engaged user base. Less likely that there will be pressure from corporate interests, more likely that every user has a vested interest in both production and consumption.

edit: And of course, you'll see the same in dedicated niche forms and spaces like HAM radio. I imagine the folks TXing EME have a particular flavor that is well maintained.