Apple saves siri conversations?

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I was flipping through my news feed and saw this. Apparently Apple monitors siri conversations by assigning us a general number and saves those conversations for a specific amount of time. They say it's only for improvement purposes and that when you turn off siri the number becomes disassociated with you. At first, I was surprised by this article, but it honestly makes sense. Nothing we post is private so why would we assume that siri would be? Apple is a business so of course they want to monitor how their products are doing.