Follow Vaya, pues es raro. en teoría es la instancia más actualizada, porque es la primera, la que ha creado el desarrollador, y es la que más usuarios tiene. A veces cierran el registro para no tener aluviones de usuarios, supongo que pudo ser algo así. Ahora mismo creo que está abierto, por si quieres probar:

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Recently, the handling of online defamation has become a hot topic on many mass media as well as social media channels. News Article for Reference: In response to these reports, it is expected that lawsuits and disclosure requests will become more publicly known; and government agencies will order stricter enforcement in addition to tightening regulations. However, under the current state of Japan, we will not be able to handle the increase of such administrative burdens and will have trouble dealing with it appropriately. Thus, we have decided to stop providing our service on and starting June 30, 2020. We are very sorry for the inconvenience and appreciate your understanding on the matter.