Intel doesn’t have to build its own fabs. AMD sold its off and is doing fine. Fabless + foundry is an excellent model that lets each side concentrate on its strengths, that works for most companies.

Intel started in an era when you did have to build your own fab. More importantly, even as others were going fabless, Intel continued to use its superiority in manufacturing as an additional advantage over their competition, who had to drop out of the fab business, and against the merchant foundries too.

But now Intel has fallen behind on both sides of the divide. I’m not sure how they will dig out.

Who manufactures them for Apple?

Wouldn't that make Apple even smarter and more efficient?