I lament it, but I understand it. Last year's reports showed that GoG was barely staying afloat. Their rival shows Linux is only 3% of current market, so GoG probably doesn't want to spread themselves any thinner until they get some surplus cash to test the waters with.

Thank goodness for Heroic launcher.

Zoom is good about promoting Linux and has DRM free games. https://www.zoom-platform.com/

Nor public movements to do with it either. They're certainly an interesting company...