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How RCS on iPhone Will Make Texting Better for Everyone
(www.cnet.com)
This is a most excellent place for technology news and articles.
No app on Android can use RCS yet, other than Google messages.
Not true. Both Samsung and Verizon messages uses RCS, so long as your carrier has implemented RCS.
Samsung had to sign a deal with Google with unknown terms and is Google messages underneath.
Verizon idk, I'm not American.
Samsung signed a deal so that they can use the Jibe API to be a part of E2E when using RCS.
Since I'm sure there's Internet where you're at, you can take a look from Verizon's RCS roll out on messages+ in 2021 to Samsung's S9, prior to relying on Google Jibe. Verizon did eventually switch to use Jibe for their entire RCS implementation now instead of relying on their own infrastructure as did T-Mobile.
Any FOSS or privacy friendly implementation?
Samsung messages is just a reskinned google messages