Pretty much the same way that Star citizen use. They started out with just the hangar where you could walk about and look at you ships. Then they added the “arena commander” module. Where you could pick up a helmet that allowed you to run a game simulator when sitting in your ship. first as single player and they then rather quickly added multi player.
Later the planet module, first person shooter module, and so on will be added, until the game got all the planned elements.
Pretty sure that this game will do is a good deal quicker. (singleplayer vs multiplayer game with consistence universe)