> Any incompatibilities with Android will be laid at Google's door

Where it belongs. Google's fork of the open RCS standard is closed source and proprietary.

> Google's version of RCS—the one promoted on the website with Google-exclusive features like optional encryption—is definitely proprietary, by the way. If this is supposed to be a standard, there's no way for a third-party to use Google's RCS APIs right now. Some messaging apps, like Beeper, have asked Google about integrating RCS and were told there's no public RCS API and no plans to build one.

https://arstechnica.com/gadgets/2022/08/new-google-site-begs...