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I don't think that's true. Every iPhone user I've texted in the last 6 months at least has had rcs turned on, and that's including some very non tech savvy friends that I doubt did it manually

It's also dependent on the telco supporting it. Australian telcos don't.

RCS compatibility with iMessages relies on the telcos to implement it, particularly for group chats.

iMessages work using SMS 1-to-1, but group chats require the telcos to enable RCS instead of SMS.

Of the 3 telco network operators in Australia, none of them have enabled it.

And no one uses WhatsApp, Telegram, Line or another cross platform messaging service?