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No, they were charging money as they had their own APN to BPN bridge. Plus the usual cost of development and more.
And it uses Apples gateway service for setup.
arstechnica.com/gadgets/2023/12/beeper-mini-on-android-claims-to-have-reverse-engineered-imessage-compatibility
Yes. I did mention APN (Apple Push Notifications) to Beeper Push Notifications which then routes via FCM for Android. The whole setup does require active server cost + time to work on the app to bring it to parity with iMessage Features.