All ur data r belongz to Siri (and her corporate masters).
What info of yours is being collected and how is it being used? When you use Siri, it’s sending your “Voice Input Data” and “User Data” to Apple to be used for a variety of purposes.
Apple is not talking about what it is doing with the data, but it is almost certainly not altruistic.
My fiend’s daughter loves her some Siri. She is almost certainly pwned by Apple.