[binaryblitz]

No, they run MacOS (or OSX for older versions), a version of Unix. The M1s still run MacOS, just on a different type of processor hardware.

[onceiwasthere]

I figure kreetx is referring to bootcamp'd intel Macs running full Linux.

[kreetx]

Yup

(Though note that Bootcamp is a macOS app to install Windows only. For linux the process less GUI assisted (but still pretty straight-forward).)