I imagine being a CUPS maintainer is not a good experience. They did something great, but probably only hear from end users when they are frustrated and not inclined to be civil.
"In March 2002, Apple Inc. adopted CUPS as the printing system for Mac OS X 10.2.[6] In February 2007, Apple Inc. hired chief developer Michael Sweet and purchased the CUPS source code.[7] On December 20, 2019 Michael Sweet announced on his blog that he had left Apple.[8]"