And Bluesky only recently came into existence. You can't possibly expect them to account for IPv6 right from the start when setting up the infrastructure, that would be silly.
Ah well, I shouldn't be so harsh on these million and billion dollar startups like GitHub. They just don't have the resources and manpower to switch over.
And now I know that Microsoft fixed the slideshow screensaver in Windows 11 so it doesn't freeze the UI for a solid minute if it can't load the images from our intranet