My whole post is about their Ecosystem and lockin — That is a Business reason.
Keep in mind Apple themselve admitted to the "evil intent" with iMessage lockin -
I will admit I am assuming their MFi cables are also this similar intent of keeping consumers locked in. . . becuase there is no "technological reason" I can fathom.
Lastly I don't assume they have an "evil intent" but a business intent.