No, they’re not, but Google won’t get them (unless, as you state, they use google’s messaging app) Less Google, more better, in my opinion.

MMS hasn’t been a thing at my provider for years now, so want to send me an image? Use Signal or whatsapp (begrudgingly). I already rarely receive or send SMS, so not enabling RCS isn’t a big loss for me, I don’t get added to Google’s statistics (which they are so very proud off), and I won’t really miss any of its features.

IIRC, Apple implemented the original spec for RCS too, so none of the Google features like e2e will even work.

I’m disabling that shit day 1, I don’t need my messages sent over Google servers - not even if they were encrypted.

I don’t even know why telecoms in Europe even bothered, and neither do they. (I asked the RCS lead at one of them, and they agreed it was kind of pointless with signal, whatsapp, …. existing)

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Using the google algorithm, which by design includes related results, is probably the worst way to “prove” anything.