4 ideas
Sam Bankman-Fried founded the crypto trading firm Alameda Research in 2017 and the exchange FTX in 2019, and by 2022 FTX was valued at about $32 billion. Customer deposits at FTX had flowed into Alameda, which spent them on trades, venture investments, real estate and political donations.
Lewis presents Bankman-Fried as someone who took any bet with positive expected value, even when a loss would be catastrophic, and who openly said he would accept a coin flip that either doubled the world's value or destroyed it. Seen this way, repeatedly accepting large, correlated, ruin-level risks makes eventual collapse close to certain even if each single bet looks favorable. This reading explains his behavior without deciding whether he intended fraud.
Bankman-Fried adopted the effective altruist strategy of earning as much money as possible in order to give it away, so personal wealth became a tool serving a large moral goal. Treating the pursuit of billions as an ethical duty gave aggressive, loosely controlled growth a moral cover that ordinary ambition would not have had. It also let backers and staff accept his conduct because of what the money was meant to do.
Lewis argues that FTX had no real accounting department, CFO or board, and that Bankman-Fried ran it by instinct and dismissed conventional oversight as a waste of time. On this account, missing controls meant no one, including leadership, could clearly see that about $8 billion in customer money was gone.