It was only a matter of time before the lawsuits would start raining down after Apple admitted to throttling CPU performance on older iPhones. Apple confirmed the practice after users complained on reddit about degraded battery performance leading to slowdowns, which was later confirmed by analysis from Primate Labs.
In fact, Apple has been

Source: Hot Hardware – Apple Slapped With Two Class Action Lawsuits For Throttling CPUs On Older iPhones