Why do you charge?
It's simple: we have to pay to send or receive the faxes on your behalf and we want to offer a sustainable product.
Last, we believe that "there is no free lunch". A lot of companies offer you free services but in exchange make you "pay" by selling your information or targeting advertisement to you. We don't do that, we prefer to charge a fair price.
We recommend that you carefully check the terms and privacy policies of services that offer you faxing for free.