alt Hacker News > RCS isn't an open platform in practice. It isn't even as open as SMS/MMS. It heavily depends on proprietary Google and carrier infrastructure in practice. We can start by replicating Google's approach and then we can work on only using carrier services for carriers where it's actually supported.
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The point of the exercise is for Google and Apple to maintain control over the ecosystem.
RCS is technically superior (protocol, transport, security, all of it) but is captured from the start on the technical level by design by the big players. From the perspective of the vast majority of users who have very limited technical awareness, it was silently slipped in as an upgrade at one point or another. This means that those not adopting the proprietary BigTech solution are perceived as being difficult by insisting on using software that's now perceived as outdated or as otherwise mildly incompatible.
From [0], it seems that RCS can use the cellular signal instead of LTE or 5G:
> In cases where RCS is able to operate over cellular networks without data, it supports messaging as well as file transfer, enriched calling, and more.
[0]: https://en.wikipedia.org/wiki/Rich_Communication_Services
The point is to access an e2ee protocol bundled by default on many devices, and is cross-platform.
GrapheneOS does recommend using superior platforms like Signal, but that is 3rd party, and thus has adoptability issues in convincing people to use it. Just because better platforms exist does not mean RCS should be ignored.
I believe it was meant to be federated, like SMS, and then in practice it wasn't. With Signal you depend on your carrier and on Signal - with SMS you only depend on your carrier.
RCS's point is to deliver ads. It is its first purpose. The way I see the situation, the point for Graphene to implement RCS is to prepare for the foreseeable deprecation of SMS. Who knows when it will happen, but better start working now than wait and get stranded when it'll happen. I'm pretty sure RCS implementation will take a long while.
RCS was DOA from day one as far as I'm concerned. The carriers being involved in any capacity deeper than providing dumb pipes alone was enough to make it pointless, but no E2E in the base spec makes it extra pointless. They may as well have just extended SMS to be more capable, because that's what they've effectively created.