Aliasalpha: Presumably there's some boring rule about not just listing every game on GOG and having you find the right games in our list
Yeah. It's called "common sense" ;).
Notice that every time GOG has a contest, they never point out every bit of detail about what you must / cannot do to win; the rules they make are never meant to be followed to the letter - it's about the spirit of them.
And, most of the time, if people have REAL doubts about how they should do something, both ways are accepted (but one of them is usually more complicated than necessary).
I'd venture a guess that this is at least partially because we're not a part of the "suing culture"...