What do you mean Android doesn't have an analog? It has both secure boot and device attestation. It has multiple APIs that can be used to design applications re

What do you mean Android doesn't have an analog? It has both secure boot and device attestation. It has multiple APIs that can be used to design applications requiring varying levels of trusted computing context. There's the high-level SafeyNet API which essentially lets you assert that you're running on a non-modified device running non-modified software in the context of a verified boot: * https://developer.android.com/training/safetynet/attestation https://developer.android.com/training/safetynet/attestation It also has the lower-level Keymaster 3 API (since 2017) which provides HSM-signed certificates with the device attestiation extension, including the system trust level and verified device identifiers: * https://source.android.com/security/keystore/attestation https://source.android.com/security/keystore/attestation * https://datatracker.ietf.org/doc/draft-bweeks-acme-device-attest/ https://datatracker.ietf.org/doc/draft-bweeks-acme-device-at... Microsoft is the one that's late to party... And your hypothesis seems pretty dependent on an argument that Apple can't build iMessaging on other platforms because they're the only platform with device attestation. That's simply not true. If Apple wanted iMessage on other platforms, they've had at least 5 years to build it in the way you theorize must be required.