[querulous]

many table games and all sports betting i know of take a commission (the rake). they are definitely not zero sum

[renewiltord]

True, but this makes wire transfers a negative sum game and we'd have to ban them.

[User23]

And all lending at interest too.

There are plenty of ways to criticize gambling as a non-productive activity, so there’s really no need to redefine game theory to do it.