Hey, there is now an Anarchism public group on Nostr. Nostr is a very simple protocol which aims to become the ultimate decentralized social network, already fulfilling functionality of Twitter, Reddit (not very advanced tho), Twitch, Telegram and more. It is also uncensorable.
It is also more anarchist than the fediverse because your identity there is not bound to a server/domain which can be shut down or moderated at any time.
To join the group, you have to search for this ID: nevent1qqs05w7vklg8ewh4g7u8rafp3dsvtcw3j7v9j4v7n4k5fxxewaggjdspp4mhxue69uhkummn9ekx7mqpz4mhxue69uhkummnw3ezuerpw3sju6rpw4esz9rhwden5te0dehhxarj9ehhsarj9ejx2assy2425
On Android the app Amethyst is very good. With Nostr, the client handles everything. The servers are just dumb relays which don't need to be trusted. That's why there are a lot of different clients. Each one is implementing different aspects of the protocol and they are always evolving.
If you want to have a peek at the group you can also check here: https://coracle.social/chat/note1lgaued7s0ja023acw86jrzmqchsar9uct92ea8tdgjvdja6s3ymqa579ar
EDIT: There are a LOT of Nostr resources available and you can decide how deep you want to dive into it. A very basic and easy introduction is https://usenostr.org/ . The devs website nostr.com also does a good job of getting the point across. There is an awesome list which can point you to any Nostr related resources like which clients to use and also what other introductory guides are availabe: https://github.com/aljazceru/awesome-nostr
Popular clients including web, desktop and mobile are also described here: https://nostr.com/clients
Note that Nostr is very decentralized and that some clients implement features which other clients don’t (yet).
This video can also show you visually how the relationship between clients and relays works: https://www.youtube.com/watch?v=yIccRIEr2gQ
"uncensorable" sounds like this is leaning more towards "anarchism is when no rules" moreso than the political philosophy of eliminating unjust hierarchies. A small anarchist community can absolutely still have rules for said community, assuming they all agreed upon said rules in a democratic manner. I personally have no interest in a community that goes out of its way to ensure hateful ideas are explicitly allowed. To that end, I think the fediverse is much more in alignment with the ideals of anarchism. I think anarchism is really intended for small clusters of individuals who can agree on the rules for that group. Sure they risk echo chambers and can have issues with diversity, and so the federation becomes a way for these groups to exchange ideas etc. with each other. It's still totally fine for specific communities to, say, block out another community that is just too incompatible or otherwise a negative presence.
Anarchism is primarily about not having hirarchies. When you have an account on beehaw.org and that server decides to block certain communities you would like to see, then you are directly dependent on that hirarchy.
I never said something about not having rules on Nostr. Your comment reads like an excuse why you don't want to check something new out. Talking about an issue that is not relevant, as that is not how the platform works. If you want to learn something new you can check the resources I linked, if you don't, well then that's how it is.