It's really only a free trial or free download.
Users never pay.
Not for software nor the worldwide faxing service. Remote Printing, also known as TPC.INT, has been a very stable Internet community service network since July 1993, tied together solely by volunteer resources, labor and hardware from around the world. Remote Printing Started by Carl Malamud of the Internet Multicasting Service and Marshall Rose of Dover Beach Consulting, TPC.INT utilizes e-mail for fax transmissions. Faxes sent via TPC.INT travel most of the distance to their recipients through the Internet, entering the world of normal fax transmission only for the final local-call hop from computer to fax machine. TPC.INT has volunteer servers running in 68 area codes in the U.S. and Canada, and in 20 countries worldwide, including Greece, South Africa, India and China.