Providing the user with source code to deploy the server side of a cloud service is a first step. The next step is to provide the tools and infrastructure to deploy on a cluster of servers for geographical redundancy and load balancing.
Ultimately, the difficulty is concurrency in the face of unreliable network and other hardware.
Google App Engine does some of this but has the critical flaw that its infrastructure is closed source, so leads to lock-in and inability to migrate away from the Google platform.
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You can deploy your own private cloud now using Openstack, and it works even on commodity hardware.
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