The document discusses dilemmas around sustainability for the European Open Science Cloud (EOSC). It notes that EOSC drivers come from both open science ambitions and industrial politics. There are interweaved but separate economies for data and electronic services that power research. Ensuring open access to data and services while also supporting long-term preservation of these digital assets presents a "commons challenge." Beyond direct funding, partnerships and visibility will be important to achieve sustainability, while adopting some private sector techniques but maintaining academic values. The document outlines several dilemmas around funding models, roles of commercial versus public infrastructure, and level of intervention, and provides recommendations to help navigate these dilemmas.