"One reason that differential privacy hasn’t been adopted more widely is that it is difficult to get right. “It’s not quite something you can deploy in a plug-and-play fashion,” said Arvind Narayanan, an assistant professor of computer science at Princeton University. “It requires a certain level of expertise. It needs a lot of careful thinking about your data.”
He also urged Apple to talk more openly about how it is using the technology. “It is a good move that they’re doing this,” he said. “However, the public would have a lot more confidence in this if it were open and were able to be audited by outside privacy experts.”"