This. I've also worked at several places that had their own in-house systems that acted like the equivalent of a smart thermostat, spinning up/scaling down resources across massive deployments targeting AWS, Azure, etc. to hit target monthly goals.
Try to do some preliminary research in the area to see if your script is sufficiently niche from the established players in the area of cloud optimization.
No. Cloud providers, like AWS, Google and Azure, make most of their money off of poorly configured enterprise infrastructure -- unused drives, VMs and K8S cluster. They provide controls that allow you to ramp down resources, but it is up to you to do the ramping.
This is not true. AWS has all sorts of tools and guidance to help you optimize spend.
I can say a lot of negative things about AWS and the culture from having been there 3.5 years. I worked in the consulting department (Professional Services).
While we wanted the customer to bring more workloads into AWS, we were all encouraged to help save the customer money where we could. No one got brownie points for coming up with a more costly solution than necessary.
Try to do some preliminary research in the area to see if your script is sufficiently niche from the established players in the area of cloud optimization.