This decision is related with the exorbitant prices of the open-access publication fees offered by hybrid journals (which can often exceed 4,000 euros per article) and is justified by the lack of real commitment of these journals to make a real transition to an international open-acess publishing model.
All in all, a quite controversial decision. What do you think?
More information:
Las APC's de revistas híbridas no serán gastos reembolsables (
ICMAB Library website)