allow revoking 'Anyone' invite link when creator/admin is no longer a group member

[dotmacro]

Problem

Currently, only the group admin/creator can revoke the "Anyone" invite link. When the admin/creator leaves the group, no other members can revoke the link. This is a great security/privacy concern because if the link is accidentally posted publicly or sent to the wrong email/account/etc, people not meant to be part of the group can join and no other members can prevent this from happening.

Solution

The "Anyone" invite link must be revocable by other group members when the admin/creator is no longer a member of the group.

[dotmacro]

Who else should be able to revoke the "Anyone" invite link?