Verizon is also switching to Android Messages as default for RCS
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Vox Media
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the Play Store
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Hiroshi Lockheimer
Android
VM+
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Summary
In the US, that only leaves one large cohort that will not use RCS as a default SMS replacement: iPhone users.Verizon has also said it will fully support interoperability between carriers, so in theory the improved images, video, read receipts, and group chats should just work — assuming everybody you’re texting with is also using Android Messages. After years of cajoling, shaming, and downright pleading, the company has made deals with carriers to simply use the standard Android Messages app, which supports RCS by default. Apple’s Messages app offers end-to-end encryption if all users are on the iMessage system, and it has shown no appetite to either offer iMessage on Android nor to adopt RCS on the iPhone.
As said here by Dieter Bohn