GNU does this I believe...
GNU does this I believe...
Legitimate questions, I'm not implying anything here
There is a group of Debian developers that collect funding and pay Debian developers/maintainers to maintain LTS for Debian releases:
https://www.freexian.com/en/services/debian-lts.html
https://raphaelhertzog.com/tag/Freexian+LTS/
The FreeBSD Foundation also hires developers to do actual work:
https://www.freebsd.org/news/status/report-2016-04-2016-06.h...
https://www.freebsdfoundation.org/what-we-do/projects/#curre...
However, I think such initiatives are typically highly underfunded. Like OpenSSH/{Open,Libre}SSL/GnuPG, everyone uses the software, few companies/individuals chip in in a significant way.
I purchased a recent copy of the book (covering Debian 8), and while there are things I'd like more details about, I find it a good resource to have on hand.
Generally the GNU project maintainers are not paid by the FSF. Mostly they're paid through the likes of Red Hat etc., with varying overlap between day job and maintainership