But seriously, there aren't any servers. There is a local development server included, to help you code your web site locally. But, it's not a server you use for production.
Much of my time as a developer is spent deploying/configuring/monitoring/managing/scaling/paying for servers. I'm tired of that. Further, I'm broke. AWS Lambda and on-demand cloud computing in general can reduce and eliminate a lot of that.
Much love for servers, much love for containers, but AWS is putting out technologies that are more efficient. The goal of JAWS is to help everyone take advantage of this new tech.