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Apple to Limit iPhone 15 USB-C Cables to USB 2.0 Speeds: Report
(www.extremetech.com)
This is a most excellent place for technology news and articles.
It wouldn't make sense to implement full USB 3 and then cap speeds. The alternative protocols like displayport over USB 3 needs the extra wires which were added in USB 3, so if the port only have USB 2 pins + power then it can't support the new USB 3 features