Ignoring the context.
Don’t pirate over Telegram, it’s no longer safe in terms of privacy and legal safety.
I’m not sure, at least iMessage will add RCS. But this has the benefit to get the correct chat bubble color for Google. I’m not sure if there’ll be anything to gain for them to include Signal. Maybe the EU will force them.
RCS isn’t E2E, and it doesn’t minimize metadata.
Moxie Marlinspike has been strongly against federation in Signal because of how it makes avoiding metadata almost impossible.
I’d say there’s basically zero chances Signal will add RCS.
E2E is not in the standard, but the Google implementation uses it.
Google added end-to-end encryption to their Messages app using the Signal Protocol as the default option for one-on-one RCS conversations starting in June 2021,[88] [89] (83] [90] In December 2022, end-to-end encryption was added to group chats in the Google Messages app for beta users and was made available to all users in August 2023.
Source: https://en.wikipedia.org/wiki/Rich_Communication_Services
