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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.
Technically, they are. Type C is just port shape. Protocol version is a different matter, however newer versions are backwards compatible. What they are doing is not restricting functionality but to unlock fastest charging speed you have to buy approved cables. It's sort of a gray area but luckily EU already caught them planning to do this, so work to change it is already underway.