Let me take you back to March, 2020. When millions of Americans woke up to find out there was a pandemic and they would be working from home now. Not a problem, I'll just call up our cloud provider and request more cloud compute. You join a queue of a thousand other customers calling in that morning for the exact same thing. A few hours on hold and the CSR tells you they aren't provisioning anymore compute resources. east-us is tapped out, central-europe tapped out hours ago, California got a clue and they already called to reserve so you can't have that either.

I use cloud all the time but there are also blackswan events where your IaaS can't do anymore for you.