CMaaS sounds amazing for resiliency engineering. There's so much I want to be doing to perturb our stack, but I don't know all the ways stuff can go wrong. Sure I can ddos it, kick services and servers offline, etc, but that's what, a few dozen failure modes? Expertise in chaos would be valuable by itself. Not to mention being able to shake parts of the system I normally can't touch.

Side note: terraform is pretty good for causing various kinds of chaos, deliberately or otherwise.