one major note about GoG’s drm freeness, most games on GoG are DRM free on Steam as well, sometimes with some small caveats though, such as the need to patch some of them, because the Steam builds of the games expect Steam to be there stuff like the achivements API and won’t handle gracefully a failure to use the API, but thats pretty easy to do most of the time and AFAIK is not an intentional anti piracy tactic