This seems to be solving a problem that most enterprise software engineers don't have. If you're at a large company that has already chosen its preferred cloud

This seems to be solving a problem that most enterprise software engineers don't have. If you're at a large company that has already chosen its preferred cloud, you're probably already spending $xxM+ with them annually and you probably get CUDs & other incentives to keep your business growing with them. That said, I've never personally seen any cloud project where there wasn't a business case review that didn't include a review of architectural plans/assumptions and expected cloud service consumption profiling. I think what's different here is that you can help engineers close a feedback loop that is often left open between when a project is planned & scoped and when 1) the landing zone (or data pipelines) is created, and 2) when the app/system is moved from test/QA into production. This could be helpful for the project/product manager, especially, because anything that looks out of whack with the forecast should be escalated promptly.