If you're at the point you're doing sophisticated cloud cost analysis you are doing the cloud right, because that is completely impossible anywhere else.
I swear the people who say go on premise have no idea how much the salary costs of someone who will not treat their datacenter like a home lab is. Even Apple iCloud is in AWS and GCP because of how economical it is, you suck at the cloud you think you have to go back on prem, or you just don't give a shit about reliability (start pricing up DDoS protection costs at anything higher than 10G and tell me the cloud is more expensive).
We spend 100k+ on AWS bandwidth and it's still cheaper than our DIA circuits because we don't have to pay network engineers to manage 3 different AZs.
I swear the people who say go on premise have no idea how much the salary costs of someone who will not treat their datacenter like a home lab is. Even Apple iCloud is in AWS and GCP because of how economical it is, you suck at the cloud you think you have to go back on prem, or you just don't give a shit about reliability (start pricing up DDoS protection costs at anything higher than 10G and tell me the cloud is more expensive).
We spend 100k+ on AWS bandwidth and it's still cheaper than our DIA circuits because we don't have to pay network engineers to manage 3 different AZs.