Apple accounts for 6% of the PC market, was 100% Intel in that market, and used almost entirely premium products. Neither company reports these specific numbers, but there is no analysis that has them as a minor customer.
What is Intel going to pivot to?
-Intel is simply dead in mobile and connected/IoT devices. They tried and failed miserably
-the PC market is shrinking even before you slice 6% off
-AMD is going absolutely gangbusters, and in many estimates is now outselling Intel to retail customers
-Intel's sole remaining cash cow, data centers, is seeing Google making their own processor, Amazon making their own processor (the Gravitron 2 is looking stellar), and now the top supercomputer in the world is an ARM based machine. AMD is back in play in the supercomputer market as well with a new Epyc entrant.
-All of this has caused Intel to slash their top tier product pricing
Intel might do okay with Optane as they scale it up and out, though their window of opportunity for that is crashing. Their other major cash cow is chipsets and motherboards, though that's contingent on you using their CPU.
I always expected Intel to dominate whatever realm they entered, but things are looking pretty grim.