How much money would your company save by hosting on some old laptops instead of in the cloud?
Right now they/we can't do it though, the talent is there but that talent is super busy reworking software that's no longer well-adapted to their new requirements. We'll see if the topic becomes more relevant in the future.
One can rent VMs from Hetzner at 1/3 the price of AWS (and 1/10 the data transfer fees). No managed services, like Dynamo or S3, but will full convenience of on-demand scale-up
Or, for mid-sized corporations - buying a rack of computers, wiring them together, and installing OpenStack to make an internal cloud - that isn't some black magic wizardry either