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Why? MacOS has a bunch of GPL stuff, such as bash, IIRC.

GPL2, I doubt you'll find any GPL3 code in there.

Which is why bash on MacOS is from 2007.

And it already has actual rsync.

It has 12 year old rsync due to Apple not wanting to ship anything that's GPLv3: https://bayton.org/2018/07/how-to-update-rsync-on-mac-os-hig...