Angela Cochran has published "Are Open Access Journals Immune from Piracy?" in The Scholarly Kitchen.
Here's an excerpt:
Even though Sci-Hub is billed as providing access to paywalled content, there appear to be thousands of open access articles in the host database. Sci-Hub provided usage of their services from 2015 to Science news writer John Bohannon with the full data set. Reviewing just the data from December 2015, I found that over 200 users accessed PLOS ONE content, over 450 users accessed Hindawi content, and a whopping 2,145 users accessed BioMed Central content.
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