In some situations it’s not a good idea or just not possible to identify/login a player immediately. You may want to do this at a later point in your game or not at all. Flox does not force you to log in your players and that’s why we also offer what we call ‘Guests’:
Guest players are essentially players that have never been logged in in any way. Your players (and you) do not need to do anything at all to become a guest player. They can just start playing. No authentication hurdles, no limitations, no nothing. You can upgrade guests to other forms of authentication at any time.
Find all about guest authentication over here.