AWS bandwidth is definitely over priced however the comparison to an unmetered colo isn't quite fair. What happens when that unmetered colo gets hit by a 100G ddos attack? Everything you have on it goes down?

In fairness, Amazon also charges for more than basic DDoS protection:

https://aws.amazon.com/shield/pricing/

but regardless, the EGRESS charges are what are absurd. The only logical reason for charging so much for data exiting is to make sure that you can't practically leave the AWS ecosystem.

If the discussion is about what it costs amazon, that's not really relevant. They avoid DDOS simply by being enormous.

We have a customer on Azure running a bunch of medium-sized websites. Their mean outbound throughput is just 25 Mbps, but they're paying on the order of $3K/month all up for that Internet egress. (Not just bandwidth but some additional overpriced services on top like App Gateway.)