I've been hearing a lot of chatter about ChatGPT's new plug-in, which lets it read and send texts with Apple Messages. These are typically end-to-end encrypted messages, now being parsed by LLMs.
This particular software runs offline, and doesn't touch OpenAI servers. But it still points to the need to actually trust the people in conversation to uphold social expectations around the privacy of the conversation. https://freedom.press/digisec/blog/chatgpt-gets-all-up-in-your-imessages/