GOG is already working on native Linux support
Source: The Verge

GOG recently posted a job listing for a senior software engineer focused on porting its Galaxy desktop client to Linux. In reply to a Reddit AMA, the GOG team revealed that work on native Linux support is already underway (PC Guide article).
Development details
It’s still too early to give an ETA, according to the Reddit thread. Founder and CEO Michał Kiciński said, “personally, I’m a big fan of Linux.” The job listing also calls Linux the “next major frontier” in gaming. Linux is becoming an increasingly important part of the PC gaming landscape, especially as Microsoft continues to add AI features to Windows that many users find unnecessary (The Verge article).
Kiciński didn’t share many details about GOG’s plans but said:
“We’re at a very early stage right now, but we of course see the rising popularity and importance of this OS for gamers and agree on its value. We’ve started the recruitment process for a Senior Engineer who would help handle it. When it comes to specifics, we can’t share much at the moment. Nonetheless, the work has started, and this will appear on GOG one day. That much we can say.”