“At Apple, we build our products and services with industry-leading privacy and security technologies designed to give users control of their data and keep personal information safe. We took steps to protect our users by blocking techniques that exploit fake credentials in order to gain access to iMessage. These techniques posed significant risks to user security and privacy, including the potential for metadata exposure and enabling unwanted messages, spam, and phishing attacks. We will continue to make updates in the future to protect our users.”
Apple protects is users by making Beeper not use E2EE
Apple reacts predictably to an embarrassing hack of their proprietary protocol (that they presumed and intended to be private) and a for profit product built on that hack. This is pretty much what any company would do, in the past, in the present and likely into the future.