We think that enabling fully synchronized gameplay across many devices will encourage people to play our games more frequently and share them more with their friends.
There are servers synchronized with the New York Stock Exchange and other exchanges, but many banks are keen on keeping the crown jewels in the server closet not the server farm.
An example of an application that does not work well in a simple cloud environment is a shared database, such as the typical Oracle database application, where the information is one big block of data that needs to be manipulated all the time by many computing processes and where access to the shared data needs to be synchronized and managed.