They may not be pushing but Github as a technical tool amassed a community of millions of users based on its functionality.

Now it's espousing radical politics as a company. Politics many users most likely don't support (based on my personal opinion and discussion about this around the web).

They are free to do as they like but trying to introduce their politics into a non-political community/userbase is a bad idea. I predict this will not work out well for them.