Yes, it's true. Github is Open source and MS is not. The two are opposites. The big issue for me is why has MS acquired it? They are not saying if they wish to destroy it or if they wish to keep the code that is already on it for their own or what...
However, if you are not a fan of MS and wish to use an alternative here's a few choices:
https://itsfoss.com/github-alternatives/ (https://itsfoss.com/github-alternatives/)
On top of that, cPanel has jumped into the game and now offers it's own version called Git Version Control which can be accessed directly within your cPanel account now, if your hosting has enabled it.
https://blog.cpanel.com/git-version-control-series-what-is-git/ (https://blog.cpanel.com/git-version-control-series-what-is-git/)