Other than that machinery for exploitation has been geographically dispersed and greatly optimized, such that these days, our slaves don't drop like flies quite so often, but instead are kept around in a state of minimal sustenance -- so that their skills can be most efficiently extracted without all the, you know, rotting corpses, piles of severed limbs & ensuing bad PR.
https://en.wikipedia.org/wiki/Leopold_II_of_Belgium
Other than that machinery for exploitation has been geographically dispersed and greatly optimized, such that these days, our slaves don't drop like flies quite so often, but instead are kept around in a state of minimal sustenance -- so that their skills can be most efficiently extracted without all the, you know, rotting corpses, piles of severed limbs & ensuing bad PR.