Misunderstandings looks like happened regarding my intention. I'm totally not interested in running my own github instance in other server just like people who signed the open letter dear-github to plead Github to add +1 button in issue which took really long to be recognized as an issue to be implemented. I'm sure if it was open source, somebody implemented the feature and made a pull request.

My intention is to make github.com "Client Side Code" better by let OSS community join into the development. So open sourcing backend and architecture is not my interest and possibly not interest of MS too. I'm not sure if Github is made of micro services, but if it is, certain client side code could be open sourced first and only that could generate great contribution to improve it.

I'm heavy user of Gitlab and disappointed because it is no longer fully open source and some enterprise features would not be welcomed to be implemented by OSS community because it conflicts with Gitlab company revenue. In my ideal world, MS splits Github source into client and backend and open source "Github client + test backend" for community to test if client code works while they make pull request and keep production backend closed. Do you think MS would be interested in this?