What are the motivations for putting things like Apple Secure Boot in there? It makes me wonder if they someday want to be able to say "this dongle is not Apple approved".
I've experienced several third party charging cables that somehow stop working so reliably immediately after an iOS update.
Apple definitely wants as much of the pie as they can get.
http://www.righto.com/2016/09/why-you-shouldnt-use-cheap-mac...
http://www.righto.com/2012/05/apple-iphone-charger-teardown-...
http://www.righto.com/2012/03/inside-cheap-phone-charger-and...