We need to correct something urgently.

You wrote:  'Recently, DOAJ started to apply the term no-fee to some journals of category 2a as well.' where your category 2a is "Discounted journals. These journals are included in deals (membership, offsetting, RaP, PaR) where libraries pay in part or wholly the publication fees so that authors have to pay less or nothing at all."

DOAJ does not use the label 'no fee' and discounted journals is not a classification that we make.

What I *think* you might mean is that you have found journals which are discounted, by your own definition, to be in our 'No APCs' filter in our Search. http://bit.ly/1HQQZ2w. Am I right? We've only ever had a simple yes/no answer to the question: 'Does this journal have article processing charges' (https://doaj.org/application/new#processing_charges-container).