There are huge economies of scale; bandwidth gets a LOT cheaper when you're buying it in CloudFlare-sized quantities. Another "secret" is CloudFlare doesn't do

There are huge economies of scale; bandwidth gets a LOT cheaper when you're buying it in CloudFlare-sized quantities. Another "secret" is CloudFlare doesn't do video (which is documented all over the product). Video is huge; every other kind of traffic combined is still pretty small compared to video.