Apple came from recreational “there is now a 10 times cheaper CPU than anything else and I can afford to build my video terminal into real computer in my bedroom” and “maybe we can actually sell it?”. [1]
ARM literally came from “we need a much better and faster processor” and “how hard can this be?” [2]
[1] https://en.wikipedia.org/wiki/History_of_Apple_Inc.#1971%E2%...
After all, Apple and ARM came from the idea to have better end user products around softer factors than shear CPU power. Since Intel‘s products aren’t highly integrated Phones nor assembled computer, Intel had no stake directly.
It is complex.