It isn't just banks either. I'm a greybeard sysadmin type who has seen the insides of hundreds of companies, and for some reason in the late 2000s it seemed like everyone from law firms to insurance companies decided to fire their IT teams and then pay 3x the money for 1/16 the service from contractor/msp-types... and they wonder why they wallow in tech debt... I'd they even knew what it is, they did fire all the people telling them about it after all!