Well, I see many resentful people here too.
"I do not give GG because my opponent plays cards from the collection that are morally correct or incorrect"
"If I enjoy not losing I give GG"
Let me tell you that this option is independent of whether the opponent plays cards or not, whether you win or not, the GG option is not subject to victory, defeat or cards in particular.
The GG that you send is for the "ethical and good manners" behavior of the rival.
For losing time deliverately when it is in advantage or not.
For sending ironic "dialogos" from the hero to you, at some point of advantage.
For continuing playing cards, even when the game is already decided in the 3 act.
For abusing any of the above options.
The GG, is between two opponents that have been respected during the meeting.
It has nothing to do with an archetype of a deck or cards.
It's about respect.
I always send GG to my rival, but it also bothers me not to receive it on the whim of a badly educated child.
The solution escapes to CDRP, is a question of general education of the player.