When banking system was created, the bills were attributed some value, something we today call as fiat currency. Its nothing but a piece of paper backed by reserve bank. Still it changed the way we do transactions( Previously it was barter). Then came the online banking, but it lacked the flexibility of true digital currency. That is where satoshi saw opportunity and gave us a system of online currencies, today we call as crypto, which can help us make blockchain based transaction. Which outweighs fiat or online banking.