I always assumed credit scores were an integral and historic part of the American financial system.
They were not, they are very recent,most of your parents didn’t have credit scores growing up, and as you can probably tell or at least intuit, it’s mostly just a b******* scheme for those with capital to accrue more capital by invading your privacy.
I believe they do use FICO but not necessarily the score itself. FICO has numerous models that can be used depending in the type of loan:
https://www.lendingtree.com/credit-repair/what-is-a-fico-credit-score/