It's standard tiered pricing. They have a free tier which is subsidized by their next tier @12c per GB but most mid sized clients get into 5c or less scale.

  First 1 GB / month	$0.000 per GB
  Up to 10 TB / month	$0.120 per GB
  Next 40 TB / month	$0.090 per GB
  Next 100 TB / month	$0.070 per GB
  Next 350 TB / month	$0.050 per GB

Above that call them it you can work out even lower prices.

That would be relevant if an important fraction of households used > 10TB. Comcast has reported only ~2% use more than 300GB. So $0.12/GB from centralized, wholesale AWS/Google is the most relevant comparison to Comcast's $0.20/GB retail.

Even accepting that which is a stretch. Your comparing the absolute worst from AWS to Comcast lowest prices. Don't forget unlike AWS Comcast charges for both upload and download and charges the full 10$ for the first bit. Making there actual costs at best 40c per downloaded GB, but more realistically there charging 10$ for people who are going to average 1/2 that bucket split 50/50 upload and down that's 80c /GB on average. And hundreds of thousands of dollars per GB in the worst case Aka 300.001 GB.

Any way you slice it AWS charges rediculusly high bandwidth costs and Comcast still charges way more than that.

I think you don't realize that nobody buys GB of traffic wholesale. They buy bandwidth.

You are technically correct, which is the best kind of correct. Nobody buys GB of traffic wholesale, they buy TB of traffic because a GB is literally a rounding error.

What you probably meant to say was that wholesale bandwith is usually puchased by the Mbps on a 95th percentile billing, although you can alternatively buy by the TB from some providers.

AWS & Google Cloud customers obviously buy by the GB.