Not to mention that Apple's rounded corners are not just a quarter of a circle stuck on the corner of a rectangle. Their corners are actually a specific design for their icons and their devices. [1] It's worth noting that they actually didn't at the time of writing have a patent on their specific corner design. I haven't read it yet but it would be interesting if corner shape this is mentioned as part of this patent.

[1] https://hackernoon.com/apples-icons-have-that-shape-for-a-ve...