Vlad
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It could be done this way: since the minimum number of members in a Clan (if I'm not mistaken) is 4, after a certain period, the system could check the last activity time of the Clan leader and the Clan members. If the last visit to the forum by all 4 members of the Clan was later than a certain time, then a message should be sent to the Clan leader. If he doesn't take certain measures, his Clan will be disbanded after a certain number of days. Also, their Clan activity will be checked. If one of the above conditions is not met, the Clan will be disbanded.
I agree with your conditions. This would be a good policy. If other users approve, I will specifically send a message to the Creator to approve the new rules.
After that, Clans will be checked for activity, say, 2 times a month.