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Re:CUPS License Change Coming by x0x0 on Friday November 10, 2017 @02:06AM (#15668442)
It looks like Apple pay for the majority of work too, assuming @michaelrsweet is paid by Apple to work on cups.

https://github.com/apple/cups/graphs/contributors

Re:CUPS License Change Coming by aeontech on Friday November 10, 2017 @02:51AM (#15668578)
He is the original developer of CUPS. Apple bought the source, and hired him back in 2007, and have employed him since then.