You're maybe not saving the game to disk, but you still have to download it. At least the assets you're going to interact with. And if you want to play again, t

You're maybe not saving the game to disk, but you still have to download it. At least the assets you're going to interact with. And if you want to play again, then you keep the game/assets in a browser cache somewhere and there's not much difference with downloading and installing the game, in terms of bandwidth/diskspace