Something not being considered here is the Apple effect. Now before you completely dismiss it offhand hear me out.
TL;DR I'm speculating a fallout between Apple and Nvidia over form factor or profit margins.
Apple indicated they're planning a new Mac Pro. The people who are most interested in getting a Mac Pro are the enthusiasts, who are also the same folks that would consider building a hackintosh.
Apple has been very quiet about their stance on hackintosh, but lets not forget Apple doesn't sell its OS. They make money selling marked-up hardware that comes bundled with the OS. Instead of announcing a position against hackintosh and risk fan base resentment Apple can sidestep the issue by creating a Mac Pro thats not compatible with off-the-shelf GPU cards, and in some way make it impossible to build a hachintosh. Price-wise Apple has no way of competing with hackintosh.
To do this Apple needs a proprietary form factor with a non-standard PCI connector. One part Apple does engineer is the motherboard. In this way Apple could licence GPUs with boards that have their connector and chip for authentication with the OS, that include Apple tax.
What does this have to do with Intel you ask? Apple no doubt made offers at some point to Nvidia and AMD to compete for exclusivity with regard to GPU support going forward. AMD obviously won out as supported by the fact the entire iMac/iMac Pro line-up use Vega. Likely that deal includes graphic support only for AMD, not Nvidia or Intel integrated, in macOS 10.14 in 2018/19.
So when it came time to do a deal with Intel and AMD for the CPUs that will be in the Mac Pro and MacBooks that will be announced when Apple releases macOS 10.14 the condition was that the CPUs with integrated graphics had to be AMD as a result of that previous agreement.
No idea wheather Apple ships 10k, 100k, or 1M combined desktops and laptops, but it was obviously worth it for Intel to win the CPU deal despite having to swallow the bitter pill of including AMD graphics in the Intel chip.
Again, this is speculation, however I have yet to hear any other reason why it would be in Intel's interest to support thier direct competitor (AMD) inside their chip except in light of this situation.
commenter got a reaction from Carlos R in So apparently, the Intel/Radeon marriage is a thing that's happening
