I am not talking about the application itself, but for users data. 500mb should be enough for all users EZlists for example, or for all data for a contact sync app. Cloud apps that offer file storage already exist and are out of the scope of this proposal exactly for the reason you mentioned (funding). Very few apps need cloud storage, maybe less than 10 for each platform. So allocating a total of 5gb to this purpose shouldn't be a real problem. If later on more apps need cloud space we could put a payment system and ask a small contribution from the users of those apps.