"“I think people don’t understand that the economics of surveillance have totally changed,” Jennifer Granick, civil liberties director at the Stanford Center for Internet and Society, told The Intercept.
“Once you have this capability, then the question is: How will it be deployed? Can you temporarily cache all American phone calls, transcribe all the phone calls, and do text searching of the content of the calls?” she said. “It may not be what they are doing right now, but they’ll be able to do it.”
And, she asked: “How would we ever know if they change the policy?”
Indeed, NSA officials have been secretive about their ability to convert speech to text, and how widely they use it, leaving open any number of possibilities.
That secrecy is the key, Granick said. “We don’t have any idea how many innocent people are being affected, or how many of those innocent people are also Americans.”"