It's not just, "I think you might find," but rather, that is precisely correct - server costs for 1 billion users is expensive. However, do you need to set up

It's not just, "I think you might find," but rather, that is precisely correct - server costs for 1 billion users is expensive. However, do you need to set up for 1 billion users in year one? Which is more expensive to start up: a railway or an internet-based software application with a very high growth rate based upon word-of-mouth?