[petard]

You don't need a some third-party thing, you can create the profile yourself using the Apple Configurator. Agree that this should be an easily accessible system setting like OP suggests.

[jaclaz]

As a matter of fact it should be "default" and need an actual "opt-in" to allow the server side logging.

[viraptor]

It's on by default because it has a very important function for Apple. If it was opt-in, Siri would be a much weaker service.

[jen20]

The configuration to allow listening at all (to start Siri by code phrase) is opt-in during device setup. While I would like to see a checkbox for allowing human review of Siri messages also, at least there is a way to _opt out_ - something most mobile devices simply do not have.