For expected utility calculations in Pascal-wagerish scenarios there can be huge difference between various very very tiny magnitudes of probability. “Zero” actually means “so small that it is reasonable to ignore the possibility”, i.e. the expected (dis)utility is tiny compared to other choices.
Unless they just use zero as a shorthand for “a very very tiny probability”, as many people do.
For expected utility calculations in Pascal-wagerish scenarios there can be huge difference between various very very tiny magnitudes of probability. “Zero” actually means “so small that it is reasonable to ignore the possibility”, i.e. the expected (dis)utility is tiny compared to other choices.