It's not necessarily the case that this contract provides bearer rights to claim any human labor or property offered or available at an asking or negotiated price. In fact, fiat money operates within a complex system of laws, regulations, and economic principles that limit its power and aims to ensure that it is used fairly and responsibly.
Furthermore, while it is true that some central bankers and their associates may benefit disproportionately from the use of fiat money, this does not mean that the system as a whole is fundamentally corrupt or unfair. Rather, it is a reflection of the fact that money is a tool that can be used for both good and bad purposes, depending on how it is managed and distributed.