What a brilliant stunt this is. I only heard about Dungeon Keeper in the backlash to what EA is doing, now I am curiuos and GOG comes in to scoop up some good will. Nice.
Looks like EA is directly involved in this[1]. A less charitable person would say it's their attempt to save face after their gaming media drubbing over their money-sink mobile version.
And a more cynical person would say this is EA's ironic way of showing how much they care about classic PC gaming in light of their sleazy ways on mobile and modern PC and console gaming.
Given my biased and prejudicial opinion of EA, I haven't ruled that out as a possibility.
On the other hand, EA is very large, so I also cannot rule out the possibility that its left hand is facepalming even while its right hand is giving all gamers everywhere the longest, fattest middle finger yet seen in the world of microtransaction-driven gaming.