In order to effectively perform its tasks, the Commission should maintain a margin of discretion as to the decision to initiate proceedings against providers of very large online platforms or of very large online search engine. Once the Commission initiated the proceedings, the Digital Services Coordinators of establishment concerned should be precluded from exercising their investigative and enforcement powers in respect of the concerned conduct of the provider of the very large online platform or of very large online search engine, so as to avoid duplication, inconsistencies and risks from the viewpoint of the principle of ne bis in idem. The Commission, however, should be able to ask for the individual or joint contribution of the Digital Services Coordinators to the investigation. In accordance with the duty of sincere cooperation, the Digital Services Coordinator should make its best efforts in fulfilling justified and proportionate requests by the Commission in the context of an investigation. Moreover, the Digital Services Coordinator of establishment, as well as the Board and any other Digital Services Coordinators where relevant, should provide the Commission with all necessary information and assistance to allow it to perform its tasks effectively, including information gathered in the context of data gathering or data access exercises, to the extent that this is not precluded by the legal basis according to which the information has been gathered. Conversely, the Commission should keep the Digital Services Coordinator of establishment and the Board informed on the exercise of its powers and in particular when it intends to initiate the proceeding and exercise its investigatory powers. Moreover, when the Commission communicates its preliminary findings, including any matter to which it objects, to providers of very large online platforms or of very large online search engines concerned, it should also communicate them to the Board. The Board should provide its views on the objections and assessment made by the Commission, which should take this opinion into account in the reasoning underpinning Commission’s final decision.
