I ran a shared services org in a Fortune 50. Enterprise costs don’t scale down well, and things that are absolutely essential to supporting 100k people sound insane for 100 people. Our senior leaders would sometimes demand we try and the CFO and I would just eyeroll.

Nobody would hire the JP Morgan IT team to run a dentist practice IT workload. Likewise, AWS can save you money at scale, but if your business can run on 3 2U servers, it should.