While I am sure that they are building a very good system, it is useful to keep in mind the difference between something developed internally and something rolled out to customers or external users. It is like the difference between a program and a product. There is a lot of work necessary to make the transition. For example, a product is made up of 1) the program 2) the release discipline, 3) manufacturing (admittedly near zero for cloud) 4) marketing and 5) support.
I would think that also whatever they have built has a bit of a proprietary nature which when exposed to the cloud would reveal things about their strategy that might make their trading strategy more public than they would want.
So I would be a little surprised if this popped up on the grid. Er, cloud.