It basically means OpenBank API mandatory just to financial companies, not to consumer, potentially any enterprise can ask to have OpenBank API access if it meet certain criteria and then it can get and commit any transaction from all EU banks. So potentially offer to their customers full API access to their EU banks, for anything, disposing transactions as well locally instead of via some crappy website. This also means having legally valid local transactions (XML/XADES or JSON/JADES signed by the bank).