I'd imagine it's similar to people who think the Divine Comedy is Christian canon, it's such a widespread work of fiction and used so matter of factly that people might think the lore has genuine basis from somewhere.
At least Necrononicon can be called "mythological artifact", I think, as it have independent circulation in peoples' heads and some, uh-m, belivers in search of "real Necronomicon"
The Cthulhu mythos was designed to be a type of modern made mythology, an emulation of how myth worked in the days of old. Due to the nature of the copyright, the Cthulhu Mythos accepts all stories written with its characters into its canon. From the original writings of H.P. Lovecraftm, Clark Ashton Smith, and Robert E. Howard, to Sucker for Love, to Cthulhu Tech.
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u/26_paperclips 8d ago
Wait you people actually consider cthulu as a mythology? I thought it was just a cool name