Apple has never built their own processors. Until the switch to Intel they had always used Motorola CPUs except for a brief period when Motorola could no longer build the PowerPC and they bought PowerPC CPUs from IBM. Apple designs the AnX processors but the build is contracted out. Really not a bad decision as fabs are very expensive to build, the technology changes rapidly necessitating expensive re-builds, and the margin is small. All of that boils down to a small ROI (Return On Investment).
However, should Apple elect to go with their own AnX processors across the board instead of Intel, building their own fab to secure the supply chain might change the ROI computation.
