It's very easy to estimate the real-world cost of on-prem or dedicated hosting - there is a wide range of providers that will quote you fixed monthly prices to manage it for you (including me) because we know what it costs us to manage various things for you.
AI is the only place I don't currently see much on-prem advantage, because buying SOTA equipment is hard, and it gets outdated too quickly.
For pretty much everything else, if you can't save 70%+ TCO, maintenance/devops included, over an optimized cloud setup, you're usually doing something very wrong, usually because the system is designed by someone who defaults to "cloud assumptions" (slow cores, too little RAM, too little fast storage, resulting in systems that are far more distributed than they need be is the typical issue).
AI is the only place I don't currently see much on-prem advantage, because buying SOTA equipment is hard, and it gets outdated too quickly.
For pretty much everything else, if you can't save 70%+ TCO, maintenance/devops included, over an optimized cloud setup, you're usually doing something very wrong, usually because the system is designed by someone who defaults to "cloud assumptions" (slow cores, too little RAM, too little fast storage, resulting in systems that are far more distributed than they need be is the typical issue).