The accounts are deleted by an automated process due to inactivity.
The accounts with no activity are sent an alert after 5 days of inactivity on the registered email. It is deleted if there is still no activity for 7 days after the reminder was sent.
The accounts with the offline cluster are sent a reminder after 14 days on the registered email. It is deleted if the clusters are still offline for 7 days after the reminder was sent.