I received zero notifications. I'm assuming they selectively decided to notify users based on how recently they had logged in perhaps, meaning that there may be a large amount of cumulative bitcoin whose owners were not notified. I only heard of anything from being on Hacker News.

Maybe, but they must have had a strange priority. While I think I logged in recently, my account has always had a zero balance.

In what form? I got one email on July 27

Email on the 27th, and also on the 19th and 20th.