They're talking inter-country traffic between two specific countries. Their peak traffic is all traffic across the globe, which includes their CDNs (content distribution networks) in each individual country so that the bulk of the traffic isn't going across countries. This is the basics of how these kinds of websites work. There is no issue with bandwidth whatsoever. This is the basics of how content distribution works.
And this is of no fault of their own; they're merely providing a paid service to users who are explicitly requesting that they send the data over. To say that an ISP has the right to extort money from a business because it's become popular and has many people requesting data from it is just silly.
