Apple does not MAKE their own silicon. Apple making their own cars would be be similar to Apple spending tens/hundreds of billions of dollars to set up their own state of the art world-class silicon foundry just to manufacture the custom silicon Apple DESIGNS. A huge outlay of capital, and a constant loss as foundries need to be operating 24/7 to be viable, and that's not even considering the R&D costs developing new processes.
If you feel differently, please write Tim Cook and Manfred Harrer and let them know they're making a huge mistake.