Silicon Valley billionaires keep getting richer, whether they want to or not. In a decade-long bull market, tech leaders who control the stock of their massive corporations keep getting fantastically wealthier — and often in ways that make their flashy philanthropic efforts pale in comparison. And too often, these tech billionaires are amassing their wealth by perpetuating income inequality in their day jobs — whether by exploiting tax loopholes, displaying anti-competitive behavior, or pricing out poorer residents in the vicinities of their companies. While many of the very richest, including Mark Zuckerberg, Steve Ballmer, and Jeff Bezos, are also among the biggest philanthropists of the modern era, the amount they give on a yearly basis often doesn’t even keep up with the appreciation of their net worths.