Biometrics may be the next frontier in how Silicon Valley will make money from our data.

If that's the case, it's only likely to be so for a very few years before we start seeing at least the more progressive jurisdictions like California putting severe restrictions on how that data can be used—not just "with consent", but "at all", given how easy it is for them to tack any kind of "and we get to sell all your data" clause into a user agreement.