Food is not a luxury. Defining things necessary for continued existence as luxuries is ridiculously reductive and is why defining jobs as “voluntary” in a world where access to those things is gated by having a job for most people is disingenuous.
Taking job A over job B could be described as voluntary but saying that you could just be homeless and scrounge food, especially in locations where the local government makes this illegal, so working is voluntary is just wrong