Poker is neither moral nor immoral - maybe

[lucksack]

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Maybe poker causes more good to people (in form of money & entertainment) than bad, since most losing players don't lose too much money compared to how much they own.

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Poker is a zero-sum game when you include all players (meaning including the rake, tips, etc).

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It's not necessarily a zero-sum game if you also value the entertainment and not just profit.