There *used* to be Mac clones, authorized ones even.
Quality ranged from good to *awful* and it almost killed Apple.
QC is one issue, but not the major one. When Apple licensed clones in the mid-’90s, they were selective enough about the companies and kept a tight enough reign on licensees that the quality was generally good; not the quality of Apple’s own offering, but not thrown-together crap.
Cloning was a misguided effort to compete with Wintel as a seller of beige-box computers. Steve killed the program when he returned to the company. Apple had hoped clones would expand the Mac into new markets; instead, the clones cannibalized sales of the Mac’s base and did little to expand it.
It didn’t work with Apple’s model, which is fundamentally different from the Wintel one — the company’s real innovations are in software, but their R&D is funded by hardware sales.
The Tao of Mac from the beginning was software and hardware designed to work together, and the business model was built around that. It is a model that has allowed Apple to thrive while several companies (including IBM with its bottomless pockets) failed to take on Microsoft as an OS vendor, and hundreds failed as beige-box PC manufacturers.