The money isn't created from "nothing" - it's definitely real money from real people's savings accounts.

The difference is that on a large enough scale, you can make a $1 of real savings circulate as though it were $1.50 or (probably a lot more) of circulating currency and there's huge benefits to doing that (when it's backed by real productivity).

The source of things like the 2008 collapse was the dark side of that - trillions of dollars debts, backed by no possible amount of productivity that could repay them (and tons of fraud allowing these to exist on the books).