Android restricts RCS to Google’s proprietary Messages app. That supports encryption with what appears to be a reasonably open protocol BUT they restrict it to

Android restricts RCS to Google’s proprietary Messages app. That supports encryption with what appears to be a reasonably open protocol BUT they restrict it to their key servers: https://www.gstatic.com/messages/papers/messages_e2ee.pdf https://www.gstatic.com/messages/papers/messages_e2ee.pdf Apple could implement their own but unless Google is willing to open up their proprietary messaging system, nobody on Android would be able to use it. Oddly, they left they out of their deceptive PR campaign which tried hard to portray E2EE as an RCS feature.