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/
Well, kinda-sorta. I've yet to hit ip block when browsing without a VPN, but VPNs and proxies definitely are getting blocked pretty consistently.
And seeing how wonderful the situation here is right now, I'm pretty familiar with VPNs at this point.