And even in the niche of MMORPG games, it's just one variant of name for the (relatively) permanent groups that players usually organize themselves in. It's rather common in the fantasy/medieval-type MMORPGs where it actually has its origins, but uncommon in pretty much all other themes, especially anything scifi. Eve Online for example calls them "corporations", which is a better fit for a science fiction universe. Anarchy Online just called them "organizations", while Star Trek Online calls them "fleets".
So yes, "guild" is a really bad name for the thing pretty much anyone in the target demographic is used to call "server", whether that thing actually was a physical or logical server or not. "Guilds" also used to have a voice "server" to host their voice chat activity, but they did never equal themselves to their voice server, so even if all games out there called groups of players "guilds", it would still be a really bad choice. Someone at Discord apparently learnt on the job that "naming stuff" is one of the two hardest problems in IT ;-)
So yes, "guild" is a really bad name for the thing pretty much anyone in the target demographic is used to call "server", whether that thing actually was a physical or logical server or not. "Guilds" also used to have a voice "server" to host their voice chat activity, but they did never equal themselves to their voice server, so even if all games out there called groups of players "guilds", it would still be a really bad choice. Someone at Discord apparently learnt on the job that "naming stuff" is one of the two hardest problems in IT ;-)