If you think “hardly any” companies use other VCS’s then I’d say you don’t get out much.
Many enterprises are either still stuck or only just now planning migration to git. They come from Perforce, TFVC, SVN, and god knows what. Big game studios are using perforce (places like Ubisoft), although my info is dated. Google does not use Git for its products either - it uses Piper.
Heck, many high-profile open-source projects held out for a long time with things like FreeBSD only recently migrating from SVN, and other BSDs even sticking to CVS.
Remember that the software development industry is extremely large, much bigger than what you read about on HN.
Many enterprises are either still stuck or only just now planning migration to git. They come from Perforce, TFVC, SVN, and god knows what. Big game studios are using perforce (places like Ubisoft), although my info is dated. Google does not use Git for its products either - it uses Piper.
Heck, many high-profile open-source projects held out for a long time with things like FreeBSD only recently migrating from SVN, and other BSDs even sticking to CVS.
Remember that the software development industry is extremely large, much bigger than what you read about on HN.