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pmyteh 10 hours ago

Some of it is formatting, some of it is just field dependent. SSRN is commercial and "good enough" for many people. It (at least used to) advertise itself as a social network for social science academics. There's also SocArXiv[0] and others, which are purer extensions of the arxiv model.

Part of the issue is that the arxiv doesn't want every discipline in science, so a certain amount of duplication is necessary.

[0]: https://osf.io/preprints/socarxiv