I am not sure how I stumbled upon it, but GOG has a new thing called Connect, which checks for the existence of certain games in your Steam account and adds them to your GOG library. The result is that it essentially gives you a DRM-free version of those games. Well, it lets you have a copy of a game in another library, which means a lot of things, but the DRM removal is the exciting part! 
Currently only a handful of games can be copied (or unlocked, or de-DRM-ed? What are we calling this?). And they are only available for a couple more days, so hurry up and check it out, and see if you have them. They say more games will be coming, and implies it is dependent on the game publishers, which of course makes sense.
I am surprised Steam did this, though I don’t think GOG is technically doing anything to take money away from Steam. They are essentially working with publishers to give free copies of their games by proving prior purchase. But it all feels really weird, ne? I mean, at least for me; I don’t know how to talk about it. But we’ll talk about it, a lot!