So an important context here is the server side implementation of RCS is Google's at every major carrier. Google bought the carrier-side provider of RCS service

So an important context here is the server side implementation of RCS is Google's at every major carrier. Google bought the carrier-side provider of RCS services, Jibe, and so the entire RCS stack is still basically just Google Chat with an "it's a standard" label on it. https://9to5google.com/2024/02/01/verizon-rcs-google-jibe/ https://9to5google.com/2024/02/01/verizon-rcs-google-jibe/ Verizon, AT&T, and T-Mobile all use Google's RCS implementation, the only way to not send Google your messages in the US is to own an iPhone and disable RCS.