I can't imagine there being enough information for true fingerprinting of individual devices. With ten million iPhones being made per month, surely the blur patterns have to have some overlap?

Amusingly this makes them more like actual fingerprints, which also lack enough information for "true fingerprinting" -- there seems to be little scientific knowledge of the error rates in matching human fingerprints in court. "Many have said that friction ridge identification is only legally admissible today because during the time when it was added to the legal system, the admissibility standards were quite low."[1]

[1] https://en.wikipedia.org/wiki/Fingerprint