As a U.S.-based organization we are required to comply with U.S. law. As such, we cannot provides services to people, organizations, or websites listed on the U.S. Treasury Department’s Office of Foreign Asset Control (OFAC) Specially Designated Nationals (SDN) list.
When it is brought to our attention that we are serving an entity on the SDN list, and if we can confirm the report, we will respond by revoking outstanding certs and banning future issuance to the entity.
That is what happened here - it was brought to our attention (not by a government agency or official) that we served usareally.com and that it was now on the SDN list so we revoked and banned.
This happens to maybe one domain per month, to give you some idea of the frequency.