[SkyBelow]

>It seems the implication is that labour should never be done voluntarily (even in a crisis situation) in a free economy.

Because when those volunteers go to get something they want, such as buying a home or paying rent, it won't be given to them free. It might be possible for some sense of social capital to exist to feel the gap, but that seems to be mostly gone these days as it has be optimized and hacked until it is no longer recognizable.