DRM isn't even worst for me, I can always use a fresh virtual machine for a game and wipe it out afterwards, but constant Internet connection requirement totally kills it, as I don't have time for games often and these rare moments I play something is usually on a laptop when I'm on vacation out of town with no reliable Internet connection. GOG is great, I can buy, own and play a game whenever I want, wherever I want and expect it to be playable many years in future, even when official servers are long dead.