We Never Ran Out of Addresses. We Ran Out of Effort.
IPv6 has been finished, free and switched on by default in every operating system for the best part of twenty years. The UK’s answer was carrier-grade NAT, a law about logging, and a £5 a month charge to give you back the address you used to have. I counted every UK network in the global routing table to find out who has actually turned IPv6 on — 1,200 of them have not, and 463 of those are sitting on address space they asked for and never used.