Context:
People have been asking for IPv6 Support on GitHub since years (probably a decade by now)
... and someone even got so annoyed that they decided to setup a dedicated website for checking this: https://isgithubipv6.live/
What the fuck are you talking about? My ISP supports IPv6 just fine, but following my VPN's advice I disable it (on certain devices at least) for privacy concerns. And it makes exactly zero difference in functionality.