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Comment by capitalsigma | Hacker News Reader

You would expect it to consume quite a lot of power and/or bandwidth if the mic was always on.

But isn't it always on for "Hey Siri"?

You can try fingerprinting, etc. Ridiculous amount of effort to implement it. For little benefit.

They do it for music identification these days.

which is such a halfhearted excuse too- "why are you randomly sampling audio around me and phoning home about it?"

  "uhh.... shazaam?"

I thought that was all done on-device?

I'm not sure. Just pointing out that it doesn't necessarily have to use a lot of power or bandwidth to have the mic always on.