I was wondering, there is that company who makes Gameranger who make old games playable with people online without giving your ip address out. Do you think GOG has ever thought of reaching out to them? I think gameranger is the best way to play older games with friends, tunngle seems a bit of a pain.

GOG have Galaxy, which (I assume, I don't actually use it myself) provides such functionality - it's up to the game developers to make use of it though (like Steam's similar thing).