The European Open Science Cloud (EOSC) is Europe’s undertaking to address the rising field of datadriven research in a more efficient way, to break down walls in existing siloed approaches for access to services and all scientific content (publications, data, software, methods), and to further evolve the ways in which researchers are able to collaborate. This paper has a twofold role: (i) to strengthen and reinforce Open Science as the modus operandi in EOSC, i.e., embedding openness by default in all stages of research, and (ii) to highlight the important role of open scientific communication and OpenAIRE participatory infrastructure as a vehicle to deliver Open Science in a trusted and reliable way.