[meta] r/btc 's "Pearl Harbor" - what happened on June 12, 2021?

I don't know what the heck happened that day, but I did find out that on that day, r/btc became completely unmoderated, briefly.

That's right - not a single moderator.

I came across this information by looking at https://www.reddit.com/r/btc in the Wayback Machine.

I am looking for historians in this sub to fill in my knowledge gap there about what happened on that day.

Afterwards, the mod roster was populated again.

And then for quite some time, it seems the moderation list became hidden, not sure if this was a general Reddit feature or something specific to this sub.

Does someone remember what caused this incident?