The intention I got from @dreamcompiler was that "A git server is much easier to set up than a subversion server.", which I feel is true.
https://svnbook.red-bean.com/en/1.8/svn.serverconfig.svnserv...
Although...you can set up a Github on-prem server -- or at least this used to be true. Talk to Github Sales and be prepared to write a check.