Well doubtless they hope the work makes some of them strong slaves because they were just faking it to be lazy because that's a real thing that definitely happens. And those it breaks and leaves disabled beyond the point of doing anything like this they leave to die in the gutter, having extracted some value from them for capital in the process and disposed of them successfully. But while they're dying they'll be desperately fighting existing workers for jobs thus allowing worsening conditions, crackdowns on unions, pay kept lower, etc.