The fact is that in the fediverse any server that has a significant IS to big to block, else userbase and interaction will suffer.
The second biggest Mastodon server is near universally defederated.
The biggest Pleroma server is also universally defederated.
You probably don’t know what these servers are, and that’s a good thing because the actual fact is defederating them improves the user experience for everyone else.
To say this isn't the case is to spread misinformation, as people who follow such advice will notice they have a much poorer Fediverse experience.
Until July 2023, the biggest Lemmy server was lemmy.ml. It has now found itself defederated by many servers. If lemmy.ml was too big to defederate, how did it find itself defederated?
The myth of “big server = undefederatable”—that is misinformation. Big servers find themselves defederated all the time. See also: Gab.
Nope, only one server I mentioned is a Mastodon server.
Actually, lemmy.world is not that big all things considered. It’s big for Lemmy, sure. But Lemmy isn’t that big at all.
Beehaw.org didn’t lose influence because they defederate the bigger servers. They lost influence because they took a heavy-handed approach to things. But if that’s how they want to run things—fine. No one owes anyone else federation.
This is not a “platform”. It’s a software distribution for an open protocol. And how people choose to use that protocol is up to them.
If you want to federate with everyone, that’s fine. If you don’t, that’s fine too. No one is putting a gun to your head and telling you who or what to associate with.
But the fact is, defederation is an option. It’s always an option.