Apple/iOS is probably one of the biggest individual drivers of IPv6 adoption. They've been requiring that iOS apps work on IPv6-only networks for close to 10 years now
The requirement is to support IPv6 only networks with IPv4 transition mechanisms. It does not preclude contacting v4-only servers.
If that's the case, how does the Github app work on iOS?
> They've been requiring that iOS apps work on IPv6-only networks for close to 10 years now
This was at the behest of mobile network. E.g., T-Mobile US has 140M subscribers, and moved to IPv6-only many years ago:
* https://www.youtube.com/watch?v=d6oBCYHzrTA