Actually, serfs were not chattel, by definition.
by this same illogical line of "thinking" (which is an
extremely charitable characterization) poor people are also not chattel, so poverty too is VOLUNTARY.
serfdom is a HEREDITARY CONDITION, you are born a serf, and unless you are manumitted, escape or are elevated to villainhood, you will DIE a serf, working the same land your forefathers worked, under whichever feudal lord currently controls the fiefdom.
it is NOT voluntary by any stretch of the imagination.
most people dont have to have this explained in such excruciating detail, nor so often, but i guess you are just voluntarily ignorant.