Illustration by Tag Hartman-Simkins / Futurism. Source: Meta / Getty Images In ancient Roman times, military generals are thought to have used a tactic known as decimation to punish mutinous groups of mercenary soldiers. Essentially, they’d kill one in every 10 unruly soldiers as a horrifying message to discipline those who remained. Today, the same tactic is evidently in play — not by bloodthirsty generals, but by tech billionaires thinning their ranks to