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Re:Ask HN: Are you satisfied with Elixir or do you regret ch... by 29athrowaway on Thursday May 20, 2021 @12:24AM (#27217360)
For many years Github ran on a fork of Ruby and a fork of Rails. Recently they upgraded to Ruby 2.7 and that's what they use now.

https://github.blog/2020-08-25-upgrading-github-to-ruby-2-7/

Re:Ask HN: Are you satisfied with Elixir or do you regret ch... by joelbluminator on Thursday May 20, 2021 @01:01AM (#27217566)
It says right in your link "Many years ago, we ran GitHub on a fork of Ruby (and Rails!) and while that hasn’t been the case for some time". So that was a long time ago, what is your point?