“Now with macOS Sequoia, Apple has replaced rsync 2.6.9 with openrsync, an implementation of rsync which is not using any version of the GPL open source license.”
Apple shipped a 2006 rsync for nearly 20 years to avoid GPLv3. Now it swapped in openrsync, which supports only a subset of the options. Users who type rsync get a different tool without warning. Scripts will break.