Apple slows your iPhone on purpose.

Because they did so without telling anyone that they were doing it and iirc, denied doing so. Once they were exposed, they explained why, but it seems very convenient.

If you're going to do this and claim it's not in an effort to make people buy a new phone, or at the very least a new battery, then why not inform people of the feature, and provide ways for the consumer to actually see the health of their battery?

Apple's entire business model depends on making you buy a new $500 (at least) phone every year or two. Oh, my phone's slowing down, must be time for a new one, right? They basically need people to be dumb and helpless. If average iPhone user could replace their own battery Apple would probably sell 30% fewer new phones. That's what frustrates me about that company. They're not only insidious, they cynically target their own end users.

Contrast: I have a Yamaha stereo receiver built in I believe 1991. Top of the line then, still better than most anything you can buy now under $3000 at least. The LCD display went out. I called their customer service line, expecting bupkus. But they not only located the part, they mailed it to me FOR FREE, along with a schematic and the instructions for replacing it. That's a company that gives a **** about its products and its customers.