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Go builds a single binary for both Linux, Windows and osx?

It doesn’t need to. It can build optimised binaries for all three.

it builds single binaries even for other processors like arm, arm64.

One of us is confused, and it very well might be me and GP, but I thought that Go can cross-compile to other platforms (different OS and arch combinations), but cannot produce (at least by default?) a single binary that can run on multiple platforms, like this article does.

Yeah Go does not do that. I don't think any lang does

I think it's pretty much a unique feature of APE, because APE binaries modify their own code after the first run to nativize themselves. (Right? Or do the new versions work different?)

I can't tell if my disdain for this is real (Since I really like having my exes read-only and having a consistent hash) or just sublimated envy (Since most desktops will in practice have every file marked as read-write, and if it works it's not stupid)

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