APPLE confirmed what many customers have long suspected: The company has been slowing the performance of older iPhones. Apple says it started the practice a year ago, to compensate for battery degradation, rather than push people to upgrade their smartphones faster. But even giving that benefit of the doubt, there are plenty of better ways Apple could have accomplished the same goal without betraying customer trust.
While many have speculated that the company has been doing this for years, Apple says the feature was implemented last year for the iPhone 6, iPhone 6 Plus, and iPhone SE. Now, with iOS 11.2, the iPhone 7 and 7 Plus are getting the same treatment, and the company intends to bring other devices into the fold down the road.
https://www.wired.com/story/apple-iphone-battery-slow-down/
https://www.forbes.com/sites/ewanspence/2017/12/20/apple-iphone-kill-switch-ios-degrade-cripple-performance-battery/#3b889ffa16a8
https://www.engadget.com/2017/12/20/apple-says-slower-performance-of-older-iphones-intentional/
https://www.macrumors.com/2017/12/21/apple-lawsuit-slowing-down-old-iphone-models/