Ok, I apologize for not making my questions clear. I was not asking about publishers changing the publication model from open-access to toll-access.
I wanted to know about the “open access” publishers whom you have removed from your list who are still “open access” and you removed them because they changed their publishing practices from those for which you initially included them in your list.
Basically the ones who are still open access but improved themselves to pass your analysis. I came to know about Hindawi and Versita Open but they were borderline if i remember correctly.
