Traffic is not important for every use case. If you run a store for physical items, how much traffic are you going to use? This is probably going to be less then 5% of your AWS bill, so you don't worry too much about it. If you host heavy images, big JS files (which you shouldn't do anyways) or offer downloads, you should probably use a CDN anyways. For big downloads, latency is not really that important as long as you get proper download speeds, so the CDN is going to be a lot cheaper.

Nor everybody wants to run the next Netflix or Dropbox in terms of bandwidth consumption. Even if you did, keep in mind that Netflix does not host the videos in the cloud.