The outage was most likely due to a issue where you could inherit other users sessions and see their chats and whatnot. While that is unconfirmed, we know the

The outage was most likely due to a issue where you could inherit other users sessions and see their chats and whatnot. While that is unconfirmed, we know the outage was different from regular at-capacity outages because they intentionally killed their API (status code 404 on all api endpoints) and you couldn’t even bypass the capacity message by being a Plus subscriber.