According to PC gaming wiki the first one should still be DRM free. The second one is probably "Below Zero" which is surely not DRM free and the third title (Subnautica 2) is not released yet.

It is possible that any of the vendors, except GOG, may add a DRM even if they at some point sold a DRM free version. So it is important to pick any DRM free version there "on time", else it may be gone forever, at some point. This also means that in many cases a good pricing is not possible but at least those getting it at a high price was showing their true support, which is important. Might be true but he does not need to understand "economics" as long as he is creating a good game and he got several million buyers, in this case around 5-10 million. The coins comes by itself... no matter DRMed... non DRMed... or even pirated in between or after that.

I suggest, the incapability or lack of will for a GOG version is a mix between "fear of DRM free" and "not really worth it" taken all the factors into account = more work for them and even "the fear" included. It is kinda a mix of several factors.

Personally i do not really understand all the hype which made this "indie game" into the "mainstream-smash-hit" it became today but i do not need to understand it... not every game is for me, but it might be "the game" for GOG as well.

Of course there are releases from Indie devs, who made them over 100 million coins in profit, who has been released on GOG. The whole matter is different for every publisher, even Indie devs.

I do not think the publisher is taking you sufficiently serious, guess that is clear enough.

Having a big commercial success might even deplete the intention for a GOG release because they think "no need for GOG anymore". Just non necessary work, as the coins are already here.

Just to tell you how they could be ticking.

I do not even think GOG should be pushing it, because it kinda is admitting "defeat" which is even less likely making any release going to happen. But i can tell you how EGS did it: They just was moving a truck-sized cargo of coins to the devs and the answer surely became "friendly". GOG simply can not make the same offer, which is in many terms a disadvantage. No need to "rate it", the stuff i say... i just love the truth more than the sweetest attitude possible.

I am glad i do not really care about this game else it might hit me harder. i do need a lot of empathy now in order to truly "get it".

Yeah, it's frustrating to see a great game locked behind all these decisions. Would have been awesome to have Subnautica properly on GOG, especially for people who care about DRM-free games. Guess all we can do is keep asking and hope they change their mind someday.