This works sometimes, but banks don't want to be overexposed (even if something is very low risk).
There's the old saying "If you own the bank $1m, that's your problem, but if you owe the bank $100M, that's the bank's problem".
This kind of stuff happens in other industries (like real estate) all the time. Even with bank financing, you'll need another source of funds (typically LPs) to meet loan requirements.
There are ways of getting capital that don't involve the public's money.