Even their downfalls are spectacular. Like a latter-day Icarus flying too close to the sun, disgraced crypto-god Sam Bankman-Fried crashed and burned this month, recasting Michael Lewis’s exuberant biography of the convicted fraudster – Going Infinite – into the story of a supervillain. Even his potential sentence of up to 115 years in prison seems more suitable for a larger-than-life comic book character – the Joker being carted off to Arkham Asylum – than a nerdy, crooked currency trader. But that’s the way this generation of tech billionaires rolls. The Elon Musk we meet in Walter Isaacson’s biography posts selfies...