The advent of Apple's iOS 14.5 update ticked off a lot of companies, particularly Facebook and Google, thanks to the App Tracking Transparency feature it brought in.
With this feature, users can opt-out of being tracked by third-party apps and stop them from collecting data from the iPhone. Of all the companies, Facebook was the most vocal about its problems with the app tracking transparency feature, the company argued that users opting out of tracking would hamper their targeted advertising, and therefore their revenue and the revenue of many small businesses. Given that about 4% of iOS users in America actually opted to be tracked by third-party apps, it's safe to say that Apple users really like and appreciate this control over their data.