Banks, Insurance , etc. are ultraconservative as far as tech. They want ultra stable systems. I had an acquaintance that had a business reselling ATMs to banks. Banks had a hard time sourcing EOL ATMs or spares. I remeber a story about some specific 486s CPUs and SIMMs that sold for 1000s, due to not being sourceable new from any supplier, and being needed as replacements for certain ATMs

Banks and insurance companies are also scared shitless of something breaking during upgrades to systems that control billions in funds