I'm always curious what RoI analysis goes into this kind of decision - whether to leave on-prem and join the cloud, or vice versa. The numbers always seem huge, and in opposite directions. "Moving from onsite datacenters to AWS saved us $2m/year!"

Has something changed with AWS' pricing recently, have their business needs changed over the years, or were the calculations (to use AWS) just wrong to begin with?

AWS can get very expensive if a company scales and things have not been setup properly