The killer we've seen is data egress costs. Crunching the numbers for some of our pipelines, we'd actually be paying more to get the data out of AWS than to compute it.
Data movement has become the number one cost in system builds energy wise.
As in, the networking equipment consumes the most energy? Given the 30x markup on AWS egress I'm inclined to say it's more about incentives and marketing, but I'd love to learn otherwise.