It does cost money to move data around, even if it is an upfront cost when you build the infrastructure. When your users move enough data that you are getting c

It does cost money to move data around, even if it is an upfront cost when you build the infrastructure. When your users move enough data that you are getting close to the capacity of your infrastructure you need to invest more money to extend your infrastructure. Or to express it slightly differently: if there weren’t any data to move you wouldn’t have to build any infrastructure and you wouldn’t have any costs. If you want to move data you have to build the infrastructure which cost money, which means that it costs money to move data.