I don't see any F-Droid apps using RCS either, so it's clearly not just because of Google's play store limitations.
RCS is a proprietary standard. You would need to be licensed by GSMA to use it.
I thought that was just to get the Google addons like encryption? Is the whole protocol proprietary?
As far as I understand the whole protocol, https://www.gsma.com/newsroom/press-release/global-operators-google-and-the-gsma-align-behind-adoption-of-rcs/
What part of that 8 year old press release tells that?
Does that mean I can use it to talk to the ISS
They have internet. So you can already email people on the ISS, if you have their email address.
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