Simple. With Shazam, you know what the payoff is. Hear a song and identify it.
Opening up your app to take a pic of a QR code and not know what you're going to get on the other end is simply not that interesting.
Honestly, I have a QR code app and I have never taken a pic of a QR code. Then again, I don't use Shazam as often as I should either. Maybe I'm not a good test case.
If these things were native to the operation of the phone, maybe I'd see the net benefit.
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