The biggest costs of server bandwidth are due to transmitting data over large distances (since the internet backbone operates on a sender-pays model when unbala

The biggest costs of server bandwidth are due to transmitting data over large distances (since the internet backbone operates on a sender-pays model when unbalanced traffic is involved in peering). By locating CDN nodes globally, Cloudflare can ensure data is sent near the last mile and thus inexpensive to send. Unless ISPs decide to shake it down the way they do with Netflix of course.