You refer initially to the “gold (author pays) open-access model”, but gold open access simply means publishing in open access journals, which may or may not involve author payment. I am just interested to know whether all the journals and publishers listed here require payment (the obvious incentive for a predator) or whether there are predators that seek something other than money. (I can imagine that newer efforts may not charge for early articles just to gain some content, to attempt to demonstrate credibility.)
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