Apple ONLY slowed down older iPhone 6/6S/6S Plus models to prevent constant premature shutdowns of these phone models when the battery started to degrade in performance.
Purchase a fresh battery, at a considerable discount and for the entire 2018 year, for an iPhone 6 or later iPhone, the phone goes back to normal operation.
Apple has not slowed down any other iDevices in this manner and have NOT slowed down ANY iPad models, at all.
iPads have much larger and larger capacity batteries and last longer than those in iPhones or iPod Touches.
I have older iPad 2 and iPad 3 models on iOS 9.3.5 and both devices are running just fine and peachy and are still running on nearly 6 and 7 year old batteries.
I have a 1st generation iPad that is still working after nearly 8 years!
I have not gotten this activation problem.
There is NO conspiracy here.