The David and Goliath nature of the struggle between up-and-coming fintechs and the established bank...: The David and Goliath nature of the struggle between up-and-coming fintechs and the established banking world has been brought into sharp relief by Citi CEO Michael Corbat, who has revealed that his firm spent $8 billion on tech last year - a sum greater than that invested by VCs across the entire US financial technology startup scene during the same period.