Re:AWS adds an extra 5.5M IPv4 addresses
by ThatPlayer on Saturday August 14, 2021 @04:52AM
(#28179166)
Another one I've heard is that CGNAT shared IPv4 addresses lead to higher hardware requirements to manage that CGNAT. So just by having IPv6 support and having more traffic go through native IPv6 saves ISPs hardware that would've been required to manage the CGNAT.
Found the video: https://www.youtube.com/watch?v=75h4gm7t1oI