USB-C wasn't exactly standard when Apple put it in Macs. Nothing else used it yet, and they didn't have any transition period. Its sole purpose for years was to get adapted to other ports. And if you wanted to use it as Lightning, you basically needed the Apple cable.
No, there weren't. Lightning cable have an authentication chip, and while it was cloned towards the end of the lifecycle, most accessories still utilized official chips.
I have been buying cheap knockoff lightning devices since my iPhone 5 at least. I can guarantee that random Chinese manufacturer wasn’t selling lightning cables in bundles of 5 for $10 using officially licensed anything from Apple.
And as far as USB C on Macs, are you complaining that Apple used an industry standard port?