> Price discrimination ("differential pricing",[1][2] "equity pricing", "preferential pricing",[3] "dual pricing",[4] "tiered pricing",[5] and "surveillance pricing"[6]) is a microeconomic pricing strategy where identical or largely similar goods or services are sold at different prices by the same provider to different buyers based on which market segment they are perceived to be part of.

That sounds exactly like what is happening here.

Intra-zone and inter-zone network traffic are two very similar services. One is free and one costs 1¢ per GB. And customers who need inter-az traffic are probably in a different market segment. Now, it is more expensive for AWS to build the infrastructure for inter-zone networking, so it isn't exclusively price discrimination, but assuming that getting more money from wealthier clients was a motivation, it seems to match the definition to me.

Re: excludability, yes it is excludable since there is a price, but that doesn't have much to do with how the price is much higher than the cost to AWS for providing the service.