Comment by alwillis

Just FYI: macOS has been a BSD-derived operating system from the beginning, using stuff from FreeBSD, OpenBSD and NetBSD on a Mach kernel. It’s a certified UNIX™ operating system.

And because GPLv3 is incompatible with how Apple operates, they ship versions of pre-GPLv3 software like Bash 3.2.

Apple now ships openrsync [1] as a replacement for rsync due to licensing issues.

[1]: https://appleinsider.com/inside/macos-sequoia/tips/what-you-...