I made a very BIG mistake -- I accidentally hit the "unsubscribe all" button on this mailing list: https://lists.wikimedia.org/postorius/lists/open-glam.lists.wikimedia.org/ thinking that since it didn't have any email address on the textbox, it wouldn't unsubscribe anyone. But now I've lost all the members on the list.
Amir is already working on this, but putting this here as his request. Also, per Amir's comment, noting that probably it might be a good idea to make a ticket on mailman about this issue. It's too easy to hit this button by accident.