In a lot of cases it's because they don't know how to build using cloud services effectively so they just spin up a lot of VMs because that's the only tool they

In a lot of cases it's because they don't know how to build using cloud services effectively so they just spin up a lot of VMs because that's the only tool they know how to use. Running VMs 24/7 is just about the most expensive thing you can do in the "cloud". But doing anything else is "too complicated".