The reason Google loves RCS is because they spectacularly failed 4 or 5 times at introducing their own iMessage competitors.

Competing companies often act in their best interests. And both Google and Apple offer OS’s which have very different value systems. I think that’s good for consumers. If I want open (and all the pros and cons that come with that) I can buy an Android phone. If I want closed (and the pros and cons that come with that) I can buy Apple. If they Apple starts to open up a bit and Google locks things down a bit we get the worst of both worlds and no true options.