Money is commonly defined as a medium of exchange. What we are exchanging is energy.
Money is a concept symbolizing the exchange of potential energy.
It is stored energy made visible. It is obvious that, like everything else, money is in itself neither good nor bad. It is neither moral nor immoral. To look at money as a moral issue is as absurd as it is to decide that airplanes are good or bad. We feel differently about airplanes when they are used to drop napalm bombs than when they are used to drop food supplies for starving people.