trynoval: Don't fall for self-insignificance syndrome. ;)
Lots of devs do care about selling their game on GOG. Devs usually know that DRM is stupid. It's publishers being negative about DRM-Free, because they often have bad knowledge of real world, living in ivory towers, and they like oppression.
GOG sell a lot of game copies, and it's an effective mechanism of motivation to remove DRM from games. You can look how Sony cared enough to publish Horizon Zero Dawn on GOG on launch. It's not a shabby thing to happen. And in case with Denuvo removal. Many games that gets Denuvo removal being published on GOG first, with Denuvo being removed from Steam version happens later. It's a hard evidence of industry's recognition of GOG.
We have devs that prefer to totally remove their games from Gog rather that providing here a patch that they already provided on Steam. Also HZD was released here months after the original PC release, same thing for Days Gone which we are still waiting to be release here, and no news about Death Stranding despite Denuvo being removed months ago.
Some devs like Gog and like to release on Gog, but I don't really think many "needs" to release one Gog, If they are on Epic and Steam they already cover 90+% of the PC market.
There is also a difference between removing Denuvo, which is something that don't really require any works as the Denuvo-less version is the one used during development and actually implementing an offline mode for a game that didn't had one.