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We might assume that the table is full of malicious players except the hero. The worst scenario would be: all players are all-in, hero wins the hand, but 1 malicious player refuses to hand in a key in order to verify the game. |Hero could have potentially won his initial chipstack times the number of other players. The malicious group must not have anything to gain from colluding in this fashion: 1) they must not have any monetary gain 2) The honest player therefore must get back at least what he was supposed to win.
The escrow needs to cover the worst case scenario: the maximum # of malicious players (n-1 for a table of n player) times the maximum amount the honest player can lose (total equity or chipstack).