Ok, you are free to choose between shit unhealthy job in factory A and shit unhealthy job in factory B. Choice is an illusion, you still have no freedom.

Say you also had the choice to pick a square of land, build a hut and grow your food on it, now that would at least grant you some degree of freedom, but since it isn't possible you are forced to work for one of these factories or starve. Relocate? Where? With which money? Just to become homeless somewhere else?

I don't know how else to call this if not some form of slavery. You are not threatened with violence, but try to strike and see what happens.