There is no point other than opportunism. The same reason kids were working in textile mills last century and why housing costs are multiplying now in the western world.
But a greedy company acting purely in self interest wouldn't want this because you are getting less productivity by making sure your employees are constantly tired and never getting anything done.
To get the full picture you need to shift perspective and see humans more as resources. When a resource doesn’t produce enough anymore it gets replaced.
