In case I wasn't clear, my argument is that egress is most expensive for someone trying to migrate away from the system (assuming a big dataset with relatively

In case I wasn't clear, my argument is that egress is most expensive for someone trying to migrate away from the system (assuming a big dataset with relatively low traffic). When comparison shopping at the beginning of a project, people often neglect the cost of someday wanting to switch. So this can be hidden vendor lock-in.