Lol this was the most blown out of proportion "gate" ever and a nothing burger really. The issue wasn't what Apple did, as it is a very common practice in the industry and I bet almost every other manufacturer did it too. The issue was that they didn't notify the user.

Could you tell me what companies did the same thing in the mobile phone industry? Did those companies notify the user?

I can guarantee you every Pixel, Samsung, or Huawei phone had similar functionality built in but was never scrutinized.

It was the opposite, slowing down the processor to preserve the battery (when a battery was quite old).