And yet, they don't. Compare that to Oracle. Plus, when Amazon makes a new cloud architecture that gets popular, others copy it. OpenStack will have this if need be in a year or two and then you can port to OS in 5 years when the rent goes up.
Oh, and FWIW, when has AWS raised a price? My servers have gotten cheaper every year I've had them with AWS (3).
Regarding OpenStack and something similar, there is the underlying workflow service (not quite the same I know) called Mistral. A project called StackStorm that is related but adds event handling and a rule engine launched a couple weeks ago.
Oh, and FWIW, when has AWS raised a price? My servers have gotten cheaper every year I've had them with AWS (3).