"A few days ago Google announced its App Engine, which lets folks build applications that run in Google’s cloud. Amazon has for a while had a number of services to let folks run applications in Amazon’s cloud. But in both of these cases, one must use their proprietary APIs. [...] I think most would prefer not to be locked-in, that cloud providers instead sold commodity services. But how can we ensure that? ..." -- AGPL: http://www.fsf.org/licensing/licenses/agpl-3.0.html