They can see who you talk to, when you talk to them and the type of messages (text/images/videos).

If your speaking to someone at the same time they are googleing a new trampoline, Google can infer your likely to be interested in trampolines as well.

That’s such fuzzy data that it really doesn’t matter at all. Point is, my messages are encrypted, and Google can think I want a trampoline if they want to think that.

Plus you said Google wants everyones messaging data, but they literally aren’t getting it. So no, that’s not why they are pushing it hard.

Apple can also run their own RCS servers (my carrier does). They simply aren’t supporting RCS because they LIKE that Android is shamed for having green bubbles. It would hurt Apple if their phones were more compatible with Android.