Apple doesn’t. Apple consumes it, so Apple always has a customer.
This is a shocking development.
Nothing prevents Apple Silicon from competing with Nvidia's ARM datacenter hardware, besides Apple. The only reason the rackmount Mac had to be depreciated is because Apple realized they were LARPing as a server hardware business.
i don't think that's accurate. the M series chips and memory architecture enable capabilities for the OS software to take advantage of, and the software and hardware teams get to collaborate to be ready for a simultaneously launch, but nothing about that is macos specific, just that they're on the same side of a walled garden.
From Wikipedia:
One of the key reasons why Rosetta 2 provides such a high level of translation efficiency is the support of x86-64 memory ordering in the M1 SoC.[12] The SoC also has dedicated instructions for computing x86 flags.
So, Apple always adds one more thing to their hardware to enable their magic.
[0]: https://en.wikipedia.org/wiki/Rosetta_(software)#Rosetta_2
you can find more apple-specific stuff by digging around in these docs: https://asahilinux.org/docs/platform/subsystems/