Or just give out Steam keys to every GOG purchasers.
This can be solution for some people, but the majority of GOG customers chose gog platfom because it's not that Steam, which can be clasified as a DRM as itself, so that wouldn't solve the actual problem - lack of usable multiplayer for non-steam players.
Instead of understanding and providing a solution, the customers meet disrespectful developers' behaviour, which is trying to put the fault on the customers/victims of their marketing lies.
