For what it's worth, Wednesday morning at 4am I had an email account associated with my developer account compromised(they both stupidly used the same password). This account was used for almost nothing but accessing my developer accounts at Apple. At the time, I thought my Apple accounts might be in trouble and I immediately changed all my Apple related passwords as well as regained control of my email account. I'm now wondering if the breach might have gone the other direction...
At the time I re-secured the two accounts, I also changed my apple developer account to a new email with 2-factor auth. Apple is still sending these announcements to the email I changed >72 hours ago.