Are client and server builds possible?

Let’s say I made an MMORPG game in UE4. Now at release I would only want to distribute the client files of course in order to avoid piracy since I want to be the only server hoster. So I guess like any other mmorpgs I need to have server and client builds. The question is… is this even possible with this engine?

Yeah just create a separate build with the server menu disabled.