Bug fixes and other improvements We've created an updated version of Beeper Mini that fixes an issue that caused messages not to be sent or received. You can get the update directly from beeper.com/update on your phone. We are still doing some final testing before submitting the update to the Google Play Store for distribution to all users. If you encounter any issues, you may need to uninstall and reinstall the app.
How else do you make them interop, other than by finding a common mapping?
Why would any company map their extended or unique elements, which they developed, to meet government regs?
They won’t, they’ll drop to the least effort required to get the regulators off their backs.
I have a choice. Apple users have a choice. There are plenty of other messenging systems out there.
MS Teams
Skype
Element
SimpleX
Signal
Telegram
Wire
Wiremin
Litewire
Discord
Conversations
Snikket
Briar
Zello
TwinMe
Tox
Keybase
Threema
Whatsapp
Jami
XMPP (which some listed use)
Just go to Wikipedia for a long list of different messengers and their capabilities.