GoG doesn't really have room to talk. With the wording of their post, just because you have access to their offline installers doesn't mean those installer wouldn't have some way of blocking you otherwise. Such as you go to install a game and it says you can't because your license was revoked.
The whole thing sucks honestly. I was so pissed off when I found out that I HAD to have Steam in order to play my physical copy of Skyrim that I almost returned the game. I was avoiding getting a Steam account for this very reason and now here we are.