
This is one of those things that everyone understands. Like “nauseous” may not be accepted as English by some upper class conservatives in charge of writing dictionaries, but to the rest of us it’s understood and frequently used.
A language is a tool to communicate, not a bunch of rules.
It’s this same grammar nazi logic that leads to dialects spoken by middle class and rich white people to be the “correct” one while those spoken by black people and lower class white people are seen as “incorrect”.
Forumverse makes the most sense but it really doesn’t roll of the tounge.
Hence I prefer Lemmyverse or Threadiverse.