Update. Another article made it through peer review (at the American Academy of Orthopaedic Surgeons) proclaiming two false generalizations, that (all or most) #OpenAccess journals charge #APCs and that (all or most) paid APCs are paid by authors.
https://journals.lww.com/jaaos/abstract/9900/the_open_versus_closed_access_publication.1671.aspx
(#paywalled)
Most OA journals are #DiamondOA and charge no APCs.
http://www.doaj.org/
Most paid APCs are paid by funders or employers, not by authors out of pocket. (Footnote: The evidence is clearer for the global north than the global south.)
https://suber.pubpub.org/pub/j1jk6hu9
On the plus side, the article reports that in field of orthopaedic surgery, OA articles have higher citation counts and altmetric scores than non-OA articles.
