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%...

[2] https://en.wikipedia.org/wiki/ARM_architecture_family