Why Section 97.117 says that transmissions to amateur stations in a different country, where permitted at all, are limited to communications incidental to the purpose of the amateur service and to remarks of a personal character. That mirrors the international treaty language (ITU Radio Regulations) that keeps amateur international contacts non-commercial and personal rather than a substitute for commercial or government message services. Third party traffic across borders is a separate matter, allowed only when the United States has a third party agreement with that country.