So borrower goes out and buys the stuff they need to make it happen. That money eventually ends up right back in the bank as a deposit. Once at the bank, it is once again loaned, spent, deposited, loaned, spent, deposited... Quickly inflating $1000 into a whole economic system worth huge figures like $100,000, not one cent of it real until all of the aforementioned economic activity actually succeeds in generating some real value. Always at risk of the whole stack unwinding due to business failures leading to defaults on loans which could cause even more defaults and liquidations and foreclosures and losses and all sorts of problems.
Multiplying that by an entire country's polulation results in truly mind-boggling amounts of money generation and therefore inflation. The actual money supply doesn't actually matter since it's a small fraction of the amount of money that's actually circulating.
The funniest part is cryptocurrency exchanges have turned into banks. They offer bitcoin lending services, savings accounts. Finite bitcoin supply? It doesn't matter. Value can always be inflated away through loans.