No Man's Sky multiplayer with Steam and GOG users

Question

Finally No Man's Sky has a multiplayer mode.

I have the Steam version. So when I want to invite people to my game I see a list of my Steam friends that own this game. But is it also possible for an owner of the GOG version of No Man's Sky to join my game?

Answer 1

I think I can answer this question myself:

Looks like the GOG's version if No Man's Sky doesn't even have the multiplayer feature so far. So the answer is "No, it's not possible right now".