Τhe presumption provided in article 7 of Law 4481/2017 is rebuttable (not irrebuttable).
The Collective Management Organisations (CMOs) are not entitled to receive the equitable remuneration of Article 49 of Law 2121/93 for musical works, whose creators, producers, musicians and performers haven’ t explicitly assigned to them the collection of the equitable remuneration of article 49.
You may read full decision (in Greek) HERE.