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Google Messages just flicked the switch on end-to-end encryption for all RCS and group chats
(chromeunboxed.com)
This is a most excellent place for technology news and articles.
but still leaks a lot of metadata to Facebook/Meta
Name, service start date, last seen date, IP address, and email address, that's it. Proof here. Everything Google and Apple also collect. If that's a problem for you use Signal, not iMessage.
I get that, but Meta/Facebook has a massive track record of not giving a shit about its users. I wouldn't recommend trusting them, they've shown their true colors many times over.
You don't have to trust them, you shouldn't trust any of them, but your messages are encrypted nonetheless