They don't need to sell them to enterprise. They can be their own customer. They have some of the bigger datacenters after all.
ARM for data storage pools seems like a good fit.
ARM for data storage pools seems like a good fit.
And Intel Xeon isn't just about the CPU, it is the enterprise grade QA and testing, Network Controller, SATA controller etc. And the Xeon-D is a very Decent offering.
Then there is scale, even though Apple's Cloud is huge, it is still no where near Amazon AWS scale, not Google and Microsoft Azure either. And even if you add all these three Cloud Giant Combined, I will bet their annual buying CPU core doesn't even come close to Apple's annual iPhone sales.
So to finalize, there just isn't any financial incentive of switching.
(Asking in a purely epistemological sense. I'm not familiar with Apple's datacenters at all.)