I believe that APOC and their allies stopped their premium and then threatened to delete if Morthy refused to end the world, rumours of APOC players threatening to hold their breath until they turned blue have been denied.
Morthy couldn't withstand this emotional onslaught and caved in. So the world will end without a winner. 4 tribes tied together in an alliance of equals. World 18 ends, not with a blast on the trumpet of victory but with the soft rattle of toys being placed back in the pram from where they came.
We never threatened to do that. Mass deletion was our original goal, before we knew a world closing was a possibility. Yes, some players recently turned off their auto-premium because they play other worlds and no point of keeping it when there are 400 villages left to noble.