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Are the messages to LLMs scanned (beyond normal collection for future training purposes) or is that just for human-to-human messenging?

Yes. I see no reason to think otherwise.

What's the purpose of this law? Protecting the recipients or punishing the senders?

I don't know what the companies want with it. But they'll try to hide the logs in discovery for a lawsuit. [1]As nyt found out.