And here's that first link in archive form, because puri.sm is suspended: https://web.archive.org/web/20240521012506/https://puri.sm/p...

TLDR: Last time this happened, it was that their registrar forgot to pay the San Marino (.sm) registry.

Hilariously, their registrar's "sm specialist" was in California - but the San Marino registry's office hours are from midnight California time to 9am California Time, so the registry's "sm specialist" was incapable of contacting the registry :D