It appears that the DOAJ is now accepting journals that are only ‘open’ in the sense that they’re available to institutions and members via JSTOR. e.g. four or five Berghahn Books titles that were listed today.
The Berghahn Books blog has no announcement I can find that these titles are about to go open access, and Google appears to know nothing either. Their only fully OA journal title appears to be Anthropology in Action, added to the DOAJ in May 2018.