[How do I select Steam or GoG?]

As Linux Support has been added to GOG (one month ago) the search for a DRM-free distibutor should have ended, shouldn´t it?

[How do I select Steam or GoG?]

It´s now dated information. GOG got Linux-Support round a month ago, so this passage should be updated to "DRM-free Gnu/Linux-Version will be publsihed via GOG, too!