[protagonist_h]

This is not an easy thing to do, especially if you use EC2 in conjunction with EBS volumes, which is typical setup. EBS volumes are created in a particular availability zone ("facility") and can only be accessed from the same zone. Therefore you not only need to distribute computing resources but also data, which is significantly harder. So even distributing across multiple Amazon data centers is not that simple. To distribute across different cloud providers you would have to rewrite large chucks of code for each provider or come up with some way to "abstract away" cloud providers. Either way it would be nightmare to manage and is likely not worth it for a typical startup. But yes, this CAN be done.