In recent decades, most cruise lines have begun adding gratuity charges to passengers' bills.
But according to Business Insider, the shift away from cash has hurt some workers.
Room stewards, for example, have seen their overall pay decrease since they now earn less in tips than they used to.
And some workers have seen no change in their overall pay at all.
But that's only because their base salaries have decreased by the amount they now receive in gratuity.
