Network Effects were a big part of it (lots of reasons why people are mentioning both GitHub and/or Linus' oversized impacts on picking a winner). I think it i

Network Effects were a big part of it (lots of reasons why people are mentioning both GitHub and/or Linus' oversized impacts on picking a winner). I think it is also worth pointing out: Mercurial also got bit by a lot of Anti-Python sentiment from very early on (laughingly, from some number of the same developers that didn't seem to mind how much git included a spaghetti mess of Perl and Bash scripts). The timing of the Python 2 -> 3 transition and the debacle that especially ensued as the various Linux distros made a particular dog's breakfast out of some of it also created additional or new Anti-Python sentiment among would be source control users.