Nanobox is a portable "micro" PaaS, we don't provide servers, we integrate with your host of choice and provision servers for you. The cost and number of servers your application needs/uses is between you and your host (AWS, DO, etc).
The $99 you pay to Nanobox is for the use of the Nanobox Dashboard to manage your application on your host (Nanobox Desktop is free).
The $99 you pay to Nanobox is for the use of the Nanobox Dashboard to manage your application on your host (Nanobox Desktop is free).