If I remembered correctly, this incident was actually widely reported in China when it broke out. It was cause by many iOS developers in China chose to download

If I remembered correctly, this incident was actually widely reported in China when it broke out. It was cause by many iOS developers in China chose to download a counterfeit version of Xcode because the network connection from China to any foreign servers are so bad. Though, it is true that Apple never disclosed the full list of compromised Apps or how many users are affected. Also, I am not sure that sending Emails to affected users would be effective. Most of affected users come from China, and a significant portion of them use phone number instead of Email to register App Store account.