Automatically logging into Google Play services or Apple Gamecenter in order to save player/game progress, high score's and stats. This allows player to save his progress and resume from the same. If the player uninstalls the game and a later point in time installs it back again, can still resume from the state where he/she left.
Ex: BLU (Google Play)
BLU uses carefully placed automatic logging into Google Play Services placed into during the game loading. This reduces player time staring at the loading screen. The automatic logging implemented starts only when the player authorizes it to the game.
