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Apple iPhone 15 relegated to USB 2.0 unless you buy the Pro
(www.pcgamer.com)
This is a most excellent place for technology news and articles.
I'm pretty certain that the USB IF decided to use the max possible Gbps as the cable rating, rather than the mess that was
USB 3.0 USB 3.1 USB 3.1 (Gen 1) USB 3.1 (Gen 2) ...
So it's more likely apple are just being specific in the type of cable you need.