The major difference between our service and theirs is that our plans aren't rated by data transferred per month. In the EU, Japan, even Australia, end users have 5G, 10G, 25G plans et al. We're "unlimited" in the sense that we could download every minute of every day of a month and with the exception of being throttled (by either the company or our flatmates) could hit theoretical maximums well outside the financial means of these international customers.
Our method is to limit traffic use by limiting how much you can use at any one time.
Theirs is to limit traffic use by letting you get whatever you want as fast as you want... but make you pay if you go over a certain line.
God help us if Broadband pricing guidelines become Wireless pricing guidelines.