Problematisch vor allem deswegen, weil Apple durch Gesetze gezwungen werden könnte, diese Daten offenzulegen.
"Apple has a good record of fighting for user privacy, but there's only so much the company could do if its objections to an order are turned down by the courts."

APPLE’S FACEID COULD BE A POWERFUL TOOL FOR MASS SPYING [wired.com]