ARM wasn’t strong on many of the platforms it’s now running and will be soon. Apple has historically backed weak hardware platforms both to a fault and to astonishing success. Part of the way they did that was maintaining cross ISA builds internally for platforms no one would bet on.

ARM has been on the rise since its creation. Gaining market share and entering new segments.

PPC has ben bleeding costumers since Apple left the boat. Even game consoles gave up. With RISC-V on the table, competition is even harder these days.