Interesting, I tried to find a reference to this online but was unable. If you can find a link to such a statement let me know.
What's kind of interesting about this to me is that Google was able to add encrypted messaging on top of RCS without the help of carriers (and it's not just because they develop/host Jibe, the most common RCS server side implementation-- E2EE messages can be sent over any RCS server/relay from what I understand). They just use a special mimetype and some base64 encoding and a custom identity server for exchanging keys. All things Apple could have done with RCS back in 2011.
What's kind of interesting about this to me is that Google was able to add encrypted messaging on top of RCS without the help of carriers (and it's not just because they develop/host Jibe, the most common RCS server side implementation-- E2EE messages can be sent over any RCS server/relay from what I understand). They just use a special mimetype and some base64 encoding and a custom identity server for exchanging keys. All things Apple could have done with RCS back in 2011.
Google's whitepaper on their E2EE: https://www.gstatic.com/messages/papers/messages_e2ee.pdf