As Joseph pointed out, the use-case for the Small Organisation Server is practically the same as FreedomBox, either installed from image or with "apt install freedombox".
I find the name "Small Organisation" a bit misleading. In my experience, often even massive companies and universities need small, easily deployed services that are maintained independently from the core infrastructure. Sometimes it is to serve remote offices with limited connectivity, or to test a new service quickly, or use it on vehicles with intermittent or expensive connectivity, or to keep very sensitive data isolated or ensure legal compliance and so on... -- Federico