At the cost of getting new sysadmins who are less numerous, but ask for more money, and best of all, you get to pay Microsoft and Amazon to train them!
It's almost like marketing makes it sound like it's a fully-managed, worry-free service where users can just call up Bill Gates himself instead of hundreds of management portals someone has to babysit.
They said that about computers going to make books disappear forty years ago… They never printed so many books that attempted to explain how those damn computers worked!