According to marsf, the long-time locale leader of the Japanese SUMO team, the decision to disband was triggered by the recent introduction of an automated translation system known as Sumobot. Deployed on October 22, the bot began editing and approving Japanese Knowledge Base articles without community oversight.

In a message posted to the SUMO discussion forum, marsf explained that Sumobot’s behavior was unacceptable for several reasons:

• It disregarded Japanese translation guidelines, resulting in literal and sometimes inaccurate text.
• It overrode existing localizations, effectively erasing community-approved work.
• It automatically approved machine-translated content for all archived articles within 72 hours, removing the review window for human contributors.
• It operated without consultation, control, or communication with the Japanese community.