Jesus Christ. It's exactly what GOG says. Compare https://www.gog.com/en/news/bgog_2022_update_2b_our_commitme...
> 1. The single-player mode has to be accessible offline.
> 2. Games you bought and downloaded can never be taken from you or altered against your will.
> 3. The GOG GALAXY client is and will remain optional for accessing single-player offline mode.
> Having said that, we believe that you have the right to make an informed choice about the content that you choose to enjoy and we won’t tell you how and where you can access or store your games. To make it easier to discover titles that include features like multiplayer, unlockable cosmetics, timed events, or user-generated content, we’re adding information about such functionalities on product pages. In short, you’ll always know.
If you want to play multiplayer HoMM3, you can. That's how the game was commercially released and it hasn't been updated to add DRM.
Modern releases DRM the game as a matter of course, and GOG defied their user base to say that that's fine with them. Do you want to play with your friend? You need an internet connection and multiple accounts registered with the vendor.
For a concrete example of Galaxy being the DRM implementation, the Gloomhaven executable you can download from GOG has the button to play multiplayer disabled. It will still work if you get around that - the functionality itself doesn't check anything. But the executable will only enable the button if you start it with Galaxy running and logged in to an account that, according to GOG, has purchased the game.
That doesn't sound like "digital rights management" to you?
In the second place, Gloomhaven does not require an external server. One player hosts the game (using the same executable used to play it), and other players connect to it. The control is exactly what I described: if you launch the game in an unapproved manner, the button that takes you to the "start or join a multiplayer game" interface is disabled. The functionality still works fine.
Note also that this is a board game, so there is no single-player gameplay. If you need to play without other people, you can control multiple players.
I know perfectly well what DRM means. No need to get nasty.
This statement is not compatible with your prior comments. Do you know what it means or not?
Can you explain that assertion?
That's not in any way what gog says. Even california law says gog sells you games (while steam only licenses them)
https://www.gog.com/about_gog
I have a disconnected windows 11 vm, and install and play gog games in it all the time. Never an issue.