Apple is using differential privacy in macOS High Sierra to figure out how best to tackle web sites that use excessive power, memory, or crash the browser tab. Basically, looking for more trends it can address, like it's already doing by actively blocking third party trackers.
This is true but it's also also being misinterpreted by those referencing the article as Apple harvesting your data to — oh, the irony! — protect your data from others. But that's not what's going on.
Here's a super-simple example of how differential privacy works:
You're at a large family dinner and a question comes up: Who likes Star Wars better and who prefers Star Trek? You want to know the split but you don't want to cause any long standing feuds. So, here's what you do: Everyone flips a coin. Anyone who gets heads marks down the true answer. Everyone who gets tails marks down a lie. Then, when you collect the answers, knowing the odds of truth vs. lie, you map back to a fairly accurate ratio. But here's the thing: You have no way of knowing which individuals lied, which means you can't figure out who really likes which franchise. So, their privacy remains inviolate, and there are no ugly food fights over Vulcan Science vs. Jedi Academy at the dinner table.
Differential privacy takes it several steps further, though. For example, if you're answering more often, it'll throttle you down so there's no chance of an identifiable pattern emerging. Likewise, if there are too few samples (perhaps rural vs. downtown in some situations) it can preemptively opt you out to preserve privacy.
In other words, Apple wants the trends — the big picture. It doesn't want the individual details that make it up. It's about stats.
Companies that harvest your data want the details. They want you. They relentlessly record every scrap of data that can to build as precise a profile of you as they can, so that they can better target you for ads.
Apple doesn't care about any of that. All Apple wants to know, in powerfully anonymize aggregate, is which web sites are giving you a bad experience, so the company can do things like suppress their trackers.
It doesn't want you. It want's the websites.
And if you haven't deliberately opted in to Apple's device analytics system, the company doesn't even get that. It gets nothing.
Apple using differential privacy to improve user experience and performance in Safari isn't the least bit ironic. It's not even poetic. But it's damn clever.
It's also yet another manifestation of the company's fierce belief in user privacy — or, if you're cynical, the privacy-first strategy Apple knows its competition simply can't compete with.
There are plenty of things you can call Apple to task over, like the abandonware status of Mac mini and Mac App Store, but using differential privacy to improve Safari isn't one of them.
Master your iPhone in minutes
iMore offers spot-on advice and guidance from our team of experts, with decades of Apple device experience to lean on. Learn more with iMore!
Rene Ritchie is one of the most respected Apple analysts in the business, reaching a combined audience of over 40 million readers a month. His YouTube channel, Vector, has over 90 thousand subscribers and 14 million views and his podcasts, including Debug, have been downloaded over 20 million times. He also regularly co-hosts MacBreak Weekly for the TWiT network and co-hosted CES Live! and Talk Mobile. Based in Montreal, Rene is a former director of product marketing, web developer, and graphic designer. He's authored several books and appeared on numerous television and radio segments to discuss Apple and the technology industry. When not working, he likes to cook, grapple, and spend time with his friends and family.