Legitimate questions, I'm not implying anything here
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.