User blog comment:TheGleamings/The Pirates of the Caribbean Online Continuation Project/@comment-3242795-20130824055726/@comment-3242795-20130825151001

Yes, but the Unity engine is not made for MMOs. MMOs typically use new game engines. Things like the game engine from Skyrim can be used anywhere on single-player games, but not multiplayer. That's why Bethesda and Zenimax couldn't use that game engine for Elder Scrolls Online.