Robette: Well, I think there are various games which have some online feature for offering daily/weekly challenges, but claiming anything you can't access purely offline is some sort of DRM seems like quite a stretch to me.
Metal Gear Solid technically has some DRM where you had to look up a radio frequency on the back of physical box.
Lifthrasil: No, if it is a part of the single player game that requires you to go online, then it is DRM. The only remaining promise of GOG, after lots of broken promises, was '100% DRM-free single-player'. I.e. single-player can be played offline. 100%. If there are quests/events in the single-player games that require you to be online, then it isn't 100% offline playable and not 100% DRM-free.
If those events you speak of are multiplayer-events only, then I don't care. At least then they don't affect the single-player games.
A code on the back of the physical box isn't exactly digital. Like the Monkey Island code wheel it is more physical than digital. But of course on GOG games such a copy protection should be patched out, like they were in the case of the Monkey Island games.
DoomSooth: I don't think Hybrid Wars was removed because GOG wanted it to be. Pretty sure it was removed from sale everywhere because Wargaming decided to kill it.
Lifthrasil: That's possible. Still, good riddance!
But everything you list is NOT part of the single player game.
DRM Free means you can play the game you bought, and owned without the game actively locking you out from playing that game, without code, or online connection to play offline.
How does having to go online, to get optional rewards online make it DRM?
You have to go online to download the damn game, and sign in to GOGs site, and that isn't DRM by your own distorted set of irrational double standards.
As for multiplayer, given that the entire industry, uses a centralised server + Local client based multiplayer.
Those servers must legally provide some guarantee of user protection, while having Unique User ID.
The added complication, is due to Steam Dominance, the "Local Network Client", is provided by Steam's Store Client, and it's not just that, "Achievements, are not, and never have been part of the game, they are specific Store Client features, that require the store clients functions to keep track of things.
Same with "Cloud Saves" part of Store client, not the game.
Basically all online features, requiring a store client.
None of them actually required to play siingle player, but how else can you even do server+client multiplayer?
Fact is without Galaxy existing, GOG would have gone bust by now. There was a serious threat of that for a while when the latest publisher trend was that every game must have all the modes. Which is why Galaxy exists, and even a hater of all Store Clients like me, cheered when it released, and I still do.
Despite never even using the damn thing.
Single Player games I wanted to play, because they had a crappy trend chasing multiplayer mode no single player gamer asked for. Right when GOG needed to pivot to selling "Good New Games", that already had downloadable versions on Steam, including from 2012+, most of the "Good Old Games" niche GOG had proved viable.
"Good Old Games", started to fill the niche for digital download versions, of the older pre internet+Steam games that never got a digital release, but by 2012, that niche was largely filled, only rare rights changing hands, or GOG's expensive efforts to track down the "lost in legal limbo", rights holders, reconcile the roadblocks, and negotiate payment.
Tell me how when practically all online multiplayer games require server login outside GOG, and a Network Client built into the Store Client to run can work without those features, none of which are actually DRM.
They are required to connect multiple-players to a centralised server system, and a simple login is required for practically everything you do online, including posting in this very thread.
DRM has a single purpose, prove you bought the game, before letting you play the game, offline, or on.
If an MPG does that, I'm not aware of it, but I don't play MPGs, and don't use Galaxy.
With DRM free, and online MPGs, intent is most important.
If the intent is, linking gamers to the servers, in safely, and securely as required by laws, it's NOT DRM.
If the intent is to provide features that require the Store Client used (because Steam does it), it's not DRM.
Not one single player game on GOG that I'm aware of in your list can't be played, without Galaxy being installed.
Feeble arguments, of you must sign in to GOG, or <Insert Site> to download content don't cut it.
Every Game/DLC/Expansion/Reward that can be downloaded, has that requirement.
You're literally saying DRM free can't even exist if you get any Digital Downloads, from secure sites.
So do we go back to Brick & Mortar Stores to buy all those DRM free Disc versions then?
Oh wait, we went all digital, and those discs were full of DRM from the start of PC gaming.
Your arguments don't actually stand up to logical scrutiny?
Get Game from secure website, with login account protection, download it, you still play game offline DRM free.
Get DLC from secure website, with login account protection, download it, you still play game offline DRM free.
Get Expansion from secure website, with login account protection, download it, you still play game offline DRM free.
Get Reward from secure website, with login account protection, download it, you still play game offline DRM free.
All are still DRM Free. Case Closed.