More details were requested by Recode to understand the various uses and working methodology that the company has planned in regards to differential privacy. So far the company had has tried to avoid the data of users which could help make services like iCloud and Siri as well as other smarter.
On each device like the iPad, iPhone and Mac, there is separate indexing of photos that happen and the facial/object recognition data is not synced. This was the example that Craig Federighi had used earlier in regards to the fact that without the use of the photos of customs, even a mountain can be recognized by the company. It was also shared by Recode that at the launch, the scope of using differential privacy by the company is said to be limited. These efforts have also been detailed by the company in the official iOS 10 press releases that can be seen online.