The idea of kill markets are of course not so new. One prominent example was the practice of paying bounties for Indian scalps which was practiced by various US government and white civilian entities during frontier conflicts against natives. They were not the first to adopt this practice but they were the ones to spread it across the continent. This incentivized wholesale extermination of native nations, and predation on innocents, rather than mere military submission, a common outcome of those frontier wars.
The idea of kill markets are of course not so new. One prominent example was the practice of paying bounties for Indian scalps which was practiced by various US government and white civilian entities during frontier conflicts against natives. They were not the first to adopt this practice but they were the ones to spread it across the continent. This incentivized wholesale extermination of native nations, and predation on innocents, rather than mere military submission, a common outcome of those frontier wars.
https://en.m.wikipedia.org/wiki/Scalping#Americas