Apple offers first party E2EE messaging for their clients, via iMessage.
As part of China’s certification requirements, Apple has been tasked to support RCS, which, per the spec, does not have E2EE feature.
I’ll say this again: RCS does not support E2EE.
If that’s not registering: RCS does not support E2EE.
Come to the think of it, it would actually be surprising if China is mandating an E2EE capable implementation, but I digress.
In order to comply with this requirement, Apple implemented RCS per the specs of RCS. Again, RCS does not support E2EE. There is no specification of RCS that supports E2EE at this time.
Google runs a proprietary system that they’ve built based off of RCS, but is not RCS. This proprietary protocol, which is not RCS, has custom extensions of their own to offer E2EE. Apple is under zero obligation to implement against this, because this is not RCS. In fact, as demonstrated, even other Android systems don’t do this. They use the carrier RCS, which while fragmented and incomplete, consistently does not have E2EE, because, again, RCS does not support E2EE.
There are plenty of cross platform E2EE solutions available: Matrix, Signal, and WhatsApp, are a few major players that popped to mind. I’m sure there are plenty of others that I didn’t call out. They are cross platform which means they already exist on both iOS and Android platforms.
Neither Apple nor Google have any reason to implement those protocols, as, again, they already exist on platform.
How is Apple not implementing Google’s proprietary extension malicious compliance as you called it?