I don’t think that matters that much; it’s still just a popularity contest, and if something manages to break through that threshold, it’ll be trivial enough to make the default.

No one knew Reddit boards and 4chan boards either; you just knew to go to /b/ or /r/funny. The other boards, the other fediverse servers, are just details that enable other subcommunities to survive. The major community will just route to a single server, and most will probably never use a second

Not who you were speaking to, but you just tried to trivialise the power of friction in a signup process, which goes _strongly_ against all known research on the topic.