mystral: The difference is that Tyranny or Pillars of Eternity are games they only published. They may well simply have agreed to let Obsidian release the game on GOG, but they obviously aren't ready to do the same for their own strategy games.

Another issue is that in the case of games like CK 2 or EU 4, the whole multiplayer is tied to Steam and they're using Steam Workshop for modding access. It would probably cost too much to redo the whole thing to port those games to GOG.
Especially since when CK 2 first came out, Paradox also released a DRM-free version on Gamersgate, but they said the sales weren't large enough to warrant supporting that version, so it hasn't been patched in years and none of the DLC or mods work for it.

At this point, I think it's obvious they've pretty much given up on having non-Steam versions of their newer games.

amok: And yes, CK I was the game that convinced them that DRM free was unprofitable, as (if I remember correctly) less than 5% of sales was DRM free

Starmaker: I may be wrong but I've repeatedly heard all Paradox games were DRM-free on Steam.

Faithful: The way I have always looked at is, Steam is the DRM.

Faithful: The way I have always looked at is, Steam is the DRM.

Starmaker: I may be wrong but I've repeatedly heard all Paradox games were DRM-free on Steam.