Wang Sicong's biggest mistake — calling people who buy Bitcoin 'sb' and not buying it himself Lang Xianping's biggest mistake — refusing 10,000 BTC Buffett's biggest mistake — thinking Bitcoin has no value Jack Ma's biggest mistake — not going all-in when BTC was just a few dozen RMB on Taobao in 2010 Soros's biggest mistake — saying Bitcoin can't be used to pay salaries Bill Gates's biggest mistake — claiming that if he were trading, he'd short BTC without hesitation