Thanks for sharing the story. Despite the whole TCO being higher, I wonder how the 8K to 6K reduction happened.
On AWS, fargate containers way are more expensive than VMs and non fargate containers are kind of pointless as you have to pay for the VMs where they run anyway. Also auto scaling the containers - without making a mess - is not trivial. Thus, I'm curious. Perhaps it's Lambda? That's a different can of worms.
As said, most of their workloads were on cheap VPSs before. Moved some to 'scale-to-zero' solutions, reduced the bloat in VMs, fixed some buggy IaC, also moved some stuff to the serverless scene. That got a decent ~20% reduction.
On AWS, fargate containers way are more expensive than VMs and non fargate containers are kind of pointless as you have to pay for the VMs where they run anyway. Also auto scaling the containers - without making a mess - is not trivial. Thus, I'm curious. Perhaps it's Lambda? That's a different can of worms.
I'm honestly curious.