The Acorn Archimedes came with Acorn branded CPUs (the "ARM250" IIRC) already in the late 80s. I can't recall what company made the chips for ARM at that time, but in the later Archimedes models it was VLSI.
This is going to be a strategic challenge for ARM unless they are going to focus on chips that nobody else wants to make. And given the AI focus, that doesn’t seem to be the case. I would think that the RISC-V folks would be salivating at the prospect of flipping some existing ARM licensees to RISC-V.
"in-house" is misleading
> Like nearly all fabless AI chipmakers, Arm currently manufactures its CPU at Taiwan Semiconductor Manufacturing Company ’s fabrication plants.
How does this fit with Meta's decision to acquire Rivos?
Arm came from Acorn and Acorn did make the first ARM CPUs for their computers, so it's not really the first time they do this.