Achievements or multiplayer matching not being implemented in the game itself isn’t on GOG. They still allow you to download and launch any game you’ve bought, without even requiring galaxy.
Also lesser known is the fact that there are DRM-free games on steam. Download them once, you can play without having steam running or even installed. Using a client to download isn’t inherently DRM either.
If I’m interpreting the quote correctly, it’s because if they have to exclude the EU because of competition laws, that implies they know it’s anticompetitive in some eay, yet roll it out elsewhere anyway.
Which shouldn’t be surprising though, if companies refrained from anticompetitive behaviour because they think it’s wrong, we wouldn’t need these laws.