A small chance is better than no chance. I was answering to the privacy concern, not the effectiveness of the method. It seems like a plausible business model to professionally collect hold biometric data encrypted with the owner's keys, opaque to the party storing the data.
It's a bit like the businesses that store umbilical cord stem cells for the very unlikely chance they'll be useful at some point in the future.
Got it. I had thought you were responding to the part you quoted.
That is, it might help on the back end, but the comment is suggesting that mass fingerprinting is not likely to move the needle much.