Eh? There have been private repositories for ages. I don't see how licenses have anything to do with it either. You don't need to have an FOSS license just to host on GitHub.
Embrace, join the open source community, and buy github. Extend, add exclusive features private repositories which do not notify copywrite holders when packages use copyleft software which mandates publishing source.
Extend, add repositories which profit from copyleft software which mandates publishing source, but github enables the thieves to hide and exploit the original developers work.
Extinguish, community now works with the thieves and contributes to parasitic repos instead of open source repositories.
Private repositories and paywall repositories are absolutely not open source.
Github must have independent auditors review private repositories and paywall repositories to prevent theft of opensource or be treated as part of the theft itself.
Also, this still doesn't address the EEE angle.