Why would cloud go away? If you’re a team of 3-4 people and have a startup idea what’s easier? Create an AWS account and smartly spin up required servers?

Or find a location (rent$), get fiber($$) to that location($$), find hardware($$), install said hardware. Now you’re back to where you were with AWS.

For larger already established businesses on prem is probably a setup you should explore but on day 0 of a new business, cloud will probably have a large cost and flexibility advantage as long as you smartly set it up.