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RCS is a failed telco standard, not a Google invention, and Apple refusing to adopt it is probably the single biggest reason it never took off.

RCS is (was?) designed so telcos can charge per message, requires (and is tied to) a phone number, and end-to-end encryption is an afterthought.

Is there even an RCS client for iOS? There is for signal…

What's happening with RCS?

why use it for a side hustle?

OP said "as a side hustle", not for. Perhaps OP resells Google services or Cloud offerings?