I dont see how GOG could do that without starting a service like steam - which is exactly what GOG buyers dont want. Also i somehow dont see the developer integrating such a feature in the GOG-Version himself - since they would be required to buy servers etc. - which would be nonsensical considering they pay steam and Gog for that service.
You do realize this is
exactly what GoG is moving to, right? It will be optional of course, time will tell if it stays that way.
