Not all disciplines use arXiv -- far from it. Especially in the humanities and social sciences, there isn&#x27;t really anything comparable to arXiv.<p>But you are right, preprints are not all that different from published papers, as this recent analysis confirmed: <a href="http:&#x2F;&#x2F;arxiv.org&#x2F;abs&#x2F;1604.05363" rel="nofollow">http:&#x2F;&#x2F;arxiv.org&#x2F;abs&#x2F;1604.05363</a><p>[edited to add:] I suppose you could look at the data (<a href="https:&#x2F;&#x2F;blog.datadryad.org&#x2F;2016&#x2F;04&#x2F;28&#x2F;sci-hub-stories&#x2F;" rel="nofollow">https:&#x2F;&#x2F;blog.datadryad.org&#x2F;2016&#x2F;04&#x2F;28&#x2F;sci-hub-stories&#x2F;</a>) and see what proportion of requested DOIs have a preprint version in the arXiv. I suspect it&#x27;s rather small.