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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.
It's full E2E encryption even without that turned on. However, just because something is encrypted doesn't mean it's secure, as you point out.
Regardless, governments/organizations have gotten very good at finding vulnerabilities and exploiting them before academic and/or private sector security groups discover the same vulnerabilities, who will then go and publish their findings which eventually leads to them getting patched. As a side note: For anyone interested in some modern hacker/cybersecurity history, I recommend reading the book, Sandworm by Andy Greenberg. It's pretty damn wild what it covers and that's only a fraction of the modern state of global cyber warfare (and yes, just about the entire world has been engaged in what pretty much amounts to cyber warfare/espionage/sabotage for the last 10-15+ years).