Comment by freedomben

Yes agreed, and they also extensively write and maintain man pages distributed with common FOSS software, and they are some of the best man pages I've ever seen. They are also freely contributed to the upstream projects so that the entire Linux ecosystem benefits.

I do wish the knowledge base wasn't behind a log in, and Red Hat isn't perfect (there are plenty of things that either don't get updated for new RHEL releases and end up cut, or aren't comprehensive enough), but they do contribute a ton to documentation that benefits everybody.