[sokoloff]

Is it really an exemption from the ToS for them to run their own operating system on other hardware?

For one thing, it would still be "Apple-branded hardware" if Apple just puts an Apple sticker on it, so would literally be compliant with the same ToS they offer to everyone, but even if it wasn't based on that technicality, they reserve all other rights to their IP, so I don't see any logical or legal reason why they couldn't either make a version of Xcode that ran on an alternate OS or run macOS on other hardware.

[jhugo]

Exactly. "Apple Cloud Server Mk.1", powered by a Xeon processor.

[hot_gril]

Better off with AS anyway. Edit: Welp, turns out it is on a Xeon in an emulator (see comment below).