When someone hands you cash and you are giving them something not a product/service (i.e. can't be a monetary instrument or a promise of in anyway providing the

When someone hands you cash and you are giving them something not a product/service (i.e. can't be a monetary instrument or a promise of in anyway providing the money back to the customer) then you are acting as a bank. So a new company can offer the service, but the aren't an armored car company they are a banking company and are required to get a banking charter. You can try create services that somehow skate the line (which is what all of the check cashing, payday advance, and title loan companies do, but they are classified as MSBs), but an AG (Attorney General) in any state where you are operating can come after you. The feds will also come after you if they think you are illegally taking deposits which can involve criminal charges.