NEW YORK, March 15 (Reuters) - Sam Bankman-Fried should spend between 40 and 50 years in prison after being convicted for stealing $8 billion from customers of his now-bankrupt FTX cryptocurrency exchange, prosecutors said on Friday. … “Even now Bankman-Fried refuses to admit what he did was wrong,” prosecutors wrote in a sentencing memorandum. “His life in recent years has been one of unmatched greed and hubris; of ambition and rationalization; and courting risk and gambling repeatedly with other people’s money.”