That’s not true, network carriers can also run RCS backends independently of Google. Graphene OS is currently working on a new messaging app that supports RCS without Google services. Both the app and the carrier have to support RCS which is why Google made their own backend.
It was never ‘Google locked’, its an open standard developed by the GSM Association that IOS has supported since 2024.
All RCS goes through google servers, they have to approve the devices. Graphene OS and e/os can’t use RCS
That’s not true, network carriers can also run RCS backends independently of Google. Graphene OS is currently working on a new messaging app that supports RCS without Google services. Both the app and the carrier have to support RCS which is why Google made their own backend.