Based on post history, this might be Elon Musk’s account.
14 karma · joined April 5, 2013
Of course, this means that call blocking apps have less features than on Android. For example, apps can't dynamically look up a number when a call is revived and make an on-the-fly decision. This is in keeping with iOS' philosophy of "privacy/security over features", vs. Android's "everything is completely open to developers, for better or worse".