Also: users were not warned about this "feature", many (most?) didn't know why their phones slowed down, and there was no way to disable the behaviour.
And I already mentioned in my initial comment that they didn't notify users. That's what the lawsuit in France was over, the lack of notice. I believe an OS update did eventually let users switch off the behaviour, and view their battery health.
But even without Apple, that particular battery was pretty easy to replace