My Harry Potter instance is doing okay, so yeah ... Harry Potter fandom is slowly growing in the Fediverse. A thing that a year ago I thought wouldn't be possible in the Fediverse. Seems really like there is enough room in the Fediverse to let different communities co-exists along with each other even if they don't agree on many things
Interesting, my first reaction is that I also wouldn't have expected it but as you say there's a lot of room in the Fediverse. In Seven Theses On The Fediverse And The Becoming Of Floss, Aymeric Mansoux and Roel Roscam Abbing talk about the Fediverse as "a site for online agonistic pluralism", and this is a good example - radically different views coexisting.
The article goes in a direction I like: plurality and to allow different communities to develop alongside each other is great. However, I still think we should push for establishing universal human rights. I'm not a fan of moral realitivism. I think every community should be able to get onto the Fediverse, but we don't need to applaud every community to do so, and can also take actions against communities that do bad things (e.g. by defederating).
I would recommend "The Dawn of Everything" by David Graber and David Wengrow, which shows how humans managed to live in different forms of community already throughout history. Maybe in the Fediverse, this could become more easy on the internet, too.