> All mobile clients are behind CG-NAT.

Demonstrably false. T-Mobile US mobile clients are IPv6-only and connect via IPv6 to IPv6 sites:

* https://www.youtube.com/watch?v=d6oBCYHzrTA

* https://www.youtube.com/watch?v=nNMNglk_CvE

NAT is only used to connect to IPv4-only hosts via DNS64 (with or without 464XLAT). As of 2022Q2, T-Mobile US has 110 million customers:

* https://www.statista.com/statistics/219577/total-customers-o...

One-third of the US population is connecting via IPv6-only on a day-to-day, hour-to-hour basis every time their smartphone reaches out over the radio.