GitHub is a proprietary, trade-secret system that is not Free and Open Souce Software (FOSS). This is enough reason to leave for a better place.
Some free platform to replace GitHub are:
also it's easy to share smaller improvements with projects hosted on GitHub via email. Use:
git format-patch
to generate patch files and send them via email to the maintainers.
Read more about Give up GitHub campaign from the Software Freedom Conservancy to understand some of the reasons why GitHub is not a good place to host FOSS projects.