timppu: GOG does not owe it to anyone to make it open source, anymore than those other stores.
Fenixp: Of course they don't, that's the distinction between 'requesting' and 'demanding' :-P
Maybe it is just me, but from the earlier linked discussion, I got a bit of the entitlement vibe, as if GOG somehow owes it to "us" to make their client (or APIs) open source.
Has any other PC gaming digital store made their official client or API open source? Humble Bundle offering torrent downloads with open source bittorrent clients doesn't count, as they are not doing any development for bittorrent. They are using existing technology, just like GOG is when offering http downloads (without a client).
timppu: ...but has nothing to do with it, really. When I download DRM-free GOG games with the current, closed source, GOG Downloader client, the games are still fully DRM-free.
shmerl: It has a lot in common with it. Namely trust. One of the aspects of DRM is that it never can be trusted. Improving trust with opening the client is in line with being DRM-free.
They are two unrelated things. Having an optional "closed source" client does not in any way take away from the ideals of offering DRM-free games. We already have a closed source GOG Downloader client, yet the games are still DRM-free.