Pheace: I'll spell it out a bit clearer then.
What are we even arguing about here? I never said anyting about the technical aspects of GOG verifying that a valid Steam license exists in the linked account for a given game and then produce a valid GOG license for it, my point was that the purpose of the GOG Connect is/was to get Steam users to create GOG accounts in the hope of getting a fraction of them to start spending at least some of their gaming budget here from then on.
I then continued to hypothesize a possible reason for why GOG's marketing team is not announcing more games on GOG Connect at least monthly if not weekly, and unfortunately by subconsciously avoiding to use the words that I can't easily retrieve from my mind I skipped the legal paperwork side of things entirely at first and come up with the likely scenario that not that many publishers and developers are overcome with joy to the idea that potentially all of their sold Steam licenses for one of their games could be duplicated to licenses for a DRM-free version without any compensation, so unless they were planning to promote a new sequel by giving the previous part in the series for free, GOG may have needed to negotiate a some kind of a compromise where they pay a more or less discounted price per a duplicated license or drop the negotiations and move on the next publisher in their list.
But enough of that, I hope it is now clear that getting a game to be featured in GOG Connect is not as simple as calling a publisher and asking can we do it, great, kthxbye, or possibly with a very small indie developer it could be, with the addition that the conversition goes like: "Can we do it? Great, we just emailed you the link to the agreement form, please fill it so we can proceed, kthxbye".