In fairness one "random DevOps dude" might be equally capable and less expensive for your infrastructure. Generally speaking any software company can succeed without a cloud provider's infrastructure, it's just a matter of cost and developing that competency in-house. There are many site reliability engineers who specialize in high availability and downtime resolution on baremetal hardware. StackExchange notably has this competency internally.
Site reliability is a new fancy name for the sucker who is on call.
They will change career after being forced to work on week ends and holidays a few times. Incidentally, today is a Sunday AND the most taken holiday of the year.
