mobile adoption is high, desktop (residential and corporate) is still quite low.
I'm a big advocate for github to add ipv6 support , but let's not pretend it's critical for their business.
just a few hours ago we found a pretty nice residential desktop use case for proper v6 (with prefix delegation), due to no need for NAT the old router (2013) became less of a bottleneck!
Aren't there serveral hosts now where IPv6 access is included but you have to pay for each attached IPv4? E.g. AWS and Hetzner