Does Apple license theirs to other platforms?

I was referring to branding. To clarify my point, I believe having branding separate from Arm’s does not substantially indicate a desire to move away from Arm.

No, and given ARM's hostility to Qualcomm's acquisition of Nuvia they probably would pitch a fit if Apple started selling silicon to third-parties.

I suspect, given Apple's pivotal role in founding ARM holdings, that they have as close to carte blanche with respect to the ARM IP as one could imagine.

Huh, I hadn't realised Apple had been one of the investors when ARM Holdings was spun out of Acorn Computers. It seems their interest was in the Newton using ARM chips.