RobinhoodMarkets (NASDAQ: HOOD)CEO Vlad Tenev built a $90 billion financial empire, but wealth was neverthe driving force behind his mission to upend traditional Wall Streetgatekeepers."WhenI started the company, I was worth nothing," Tenev said duringa Bloomberg Wealth interview. "But things haven't changed verymuch for me, as it might be a little bit surprising because I wasnever really doing it for the money."TheBulgarian immigrant's journey from aspiring mathematician to fintech disruptorreveals how Sil ...