Git also massively benefitted from GitHub. Do you know a single person who even knows you can use git without a "forge" like GitHub, let alone knows how to or actually does it?
It's hard to remember but there was a time when git was resisted. When I first started to use it, a lot of people were saying you don't need it, you only want to use it because it's hipster and the kernel uses it, but you're not the kernel etc. It's exactly the same as k8s is all these years later (the tide seems finally turning on k8s, though).
Without GitHub (or something else), git would have remained a weird kernel thing. But, equally, without git GitHub would have had no raison d'être. It's a symbiotic relationship. GitHub completely the picture and together they won.
I taught my research group Git version control in college. It was part of a "new student/researcher onboarding" series that we put all the new grad students and undergrads through. But we were in Radio Astronomy, so there was a lot of data processing and modeling stuff that required being comfortable within a remote ssh session and the basics of Linux/bash/python. I know it was already being used in Radio Astronomy (at least in the sub-field of Pulsar Astronomy) at the time and was part of the reason I didn't get pushback when I proposed making sure our group was trained up on using it.
We switched to Git as a whole in early 2009 since it was already a better experience than SVN at the time. Could be off by a year or two, given how long ago this was and the fact that I was working with the group through the end of high school in 2007-2008.
We only added GitHub to our training later in 2011-2013 era, but we ran our own bare git repos on our department servers until then. And students/groups were responsible for setting up their own repos for their research projects (with assistance/guidance to ensure security on the server).
Last job also made use of our own internal bare repos, admittedly mirrors of our private GH projects, and our stack pulled from that mirror to ensure we always had an instance that was not dependent on an external vendor.
Current role also makes use of bare git repos for similar reasons.
I think the knowledge is there and plenty people do it, it's just not news/blog worthy anymore. It's not new or groundbreaking so it gets little attention.
It's hard to remember but there was a time when git was resisted. When I first started to use it, a lot of people were saying you don't need it, you only want to use it because it's hipster and the kernel uses it, but you're not the kernel etc. It's exactly the same as k8s is all these years later (the tide seems finally turning on k8s, though).
Without GitHub (or something else), git would have remained a weird kernel thing. But, equally, without git GitHub would have had no raison d'être. It's a symbiotic relationship. GitHub completely the picture and together they won.