Banks, on the other hand, have a multitude of ways of generating substantial incomes through interest earned in business and housing mortgages and loans, fees etc. Banks earn their money by charging people interest on various kinds of loans using their depositor's money. Their profit is based on the difference between the cost of borrowing money and the interest charged for loans. Depositors are happy because they don't have the headache of dealing with possible collection problems and their principle and interest is guaranteed by the bank. Dealing with these kinds of problems with the accompanying risks is the speciality of the banking industry.
Banks have to work to earn their profits.
I don't see how this is related to a ponzi scheme. The only work involved in a ponzi scheme is to promote the scheme. And the interest on these fraudulent bonds has to also be created by more borrowing. Thus, the money supply has to be constantly expanded, because the interest has to be paid, ahead of any other government expense. If the interest on the bonds is not paid, the money system will collapse immediately.