There's no mandatory subscription. Once you by a game, you can play it until whole service shuts down without any further fees. It is the same as with most Stea

There's no mandatory subscription. Once you by a game, you can play it until whole service shuts down without any further fees. It is the same as with most Steam games - you also don't legally own them and they only start with internet connection due to drm. Indeed it's very different from GOG that gives you full ownership and perpetual offline access.