Topic on PCGamingWiki talk:GOG.com Enhancement Project/archive
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IMO it's still useful to have the DRM-free and also the GOG.com icons for all GOG.com games (since it does use a downloader client of sorts).
Also in cases like Witcher and Witcher 2, the Steam row would include the (Steam), (GOG.com) and (DRM-free) icons - since you can register it onto GOG.com even though you bought it on Steam.