One of the original pioneers of IPv6-in-the-field is Comcast. They didn't push IPv6 for consumer tracking reasons, they pushed it because there are literally m

One of the original pioneers of IPv6-in-the-field is Comcast. They didn't push IPv6 for consumer tracking reasons, they pushed it because there are literally more CPE devices on their network than there are private addresses (ie. they exhausted 10/8, 192.168/16, etc) and they had to start requesting publicly addressable IPs for their internal network. IPv4 does not scale to the modern world. It does not even scale to a single (large) network in the modern world.