"Try playing the game with nobody from dath ilan and see how far you get!  They find out that many entities inside the large universe are bigger than them and indifferent to their own welfare, and then they go insane, screaming and clawing at the walls or tweeting about how the orthogonality thesis is false.  If now you're like 'why would that drive anyone insane, it's just a big indifferent universe with some big entities', that is the point of playing games containing a piece from dath ilan, even if we can't coordinate with you at all."

"Anyway.  I can't ask you to do anything differently conditional on what I do, because that would be coordination.  But I, Nyaaaaaarlathotep, now declare --"

"Try playing the game with pieces all not from dath ilan and see how far you get!  They find out that many entities inside the large universe are bigger than them and indifferent to their own welfare, and then they go insane, screaming and clawing at the walls or tweeting about how the orthogonality thesis is false.  If now you're like 'why would that drive anyone insane, it's just a big indifferent universe with some big entities', that is the point of playing games containing a piece from dath ilan, even if we can't coordinate with you at all."

"Anyway.  I can't ask you to do anything differently conditional on what I do, because that would be coordination.  But I, Nyaaaaaarlathotep, now declare --"

"Try playing the game with pieces all not from dath ilan and see how far you get!  They find out that many entities inside a vast universe are bigger than them and indifferent to their own welfare, and then they go insane, screaming and clawing at the walls or tweeting about how the orthogonality thesis is false.  If now you're like 'why would that drive anyone insane, it's just a big indifferent universe with some big entities', that is the point of playing games containing a piece from dath ilan, even if we can't coordinate with you at all."

"Anyway.  I can't ask you to do anything differently conditional on what I do, because that would be coordination.  But I, Nyaaaaaarlathotep, now declare --"