Yes, but no. RCS itself is. Google RCS however, not especially. Google keeps promising to open up the bits they’ve tacked on but have yet to. Which includes things like the open end-to-end encryption. Apple will be implementing vanilla RCS which does not have that yet. But they have claimed if I remember correctly that they are going to help develop that. I don’t know if I believe that or if that’s just something they said to foster some false Goodwill