Such a recording contains quite a bit more than your average search engine query.
When you use voice activation commands like
"OK Google" or touching a microphone icon, a
recording of the next thing you say, plus a
few seconds before, may be used and stored
by Google and associated with your Google
Account to help recognize your voice and
improve speech recognition. [1]
Wiretapping is when someone records you secretly, so I don't see how the laws would apply here. It's just like you can record your phone calls if you answer them with "hi, this is SilasX, and this call is being recorded."[1] http://cdn3.pcadvisor.co.uk/cmsdata/features/3535224/OK_Goog...
a) It doesn't alert you each time, b) you can use the Siri without getting such a notification (at least not frequently enough that I remember receiving one), c) Siri doesn't answer with "this is Siri and this call is being recorded", d) it's easy to trigger the recorder accidentally, e) it's not even clear to the user that the request is sent home for processing (rather than being handled locally), and f) this wouldn't cover bystanders.
c) Why would it? You've already consented.
d) So?
e) It tells you that your voice data may be processed online, it requires a data connection for processing.
f) There's no law on the books anywhere, as far as I'm aware, that covers bystanders.
I knew that my searches were probably tracked when I started using Cortana (similar to any other search - unless you're using DDG,) and personally I'm ok with it if it results in a great experience for me. And I'm amazed almost daily at how solid Cortana (and Google voice search for that matter) is.