I think he's talking about disabling it on his own Mac and the added security benefits of having it enabled on Macs used by normal users which benefit from the additional security.
As we are using docker that is not possible at the moment. We are working on a new daemon which may support running servers outside of containers and on Windows servers at some point in the not so near future.
For lots of games there is server software available (e.g. Minecraft) which allows a server to become host and all players can then join the server and play together. This panel allows to easily control those servers ;)