[cmrdporcupine]

Apple didn't adopt PowerPC after fighting with Motorola and it was no shock to Motorola, or the world. Motorola and Apple and IBM worked together on PowerPC in a consortium, after the Motorola 88000 RISC (which Apple also tried) failed for various reasons.

This was all in the exiled-Jobs years while Apple was thrashing about trying to build a real operating system (or systems) to replace classic Mac OS. (NeXT also played with the m88k.)

And ARM wasn't new to Apple with the iOS systems, either. The Newton was built around ARM back in the 90s.

[scholia]

Yes. In fact, the Newton was the reason ARM was formed as a separate company. The chip design was originally done by Acorn (using VTI tools). When the ARM operation was spun out of Acorn under joint ownership (Acorn, Apple and VTI), they changed the A from Acorn to Advanced.