Not sure of exact explanation exactly, but certainly consistent trend upon that graph. Though does bug me when you have time based graphs using time and no indication what TZ the midnight/day cut-off mark used - may be using browser local, may not, you just don't know.
I've got a VPS as well with Linode that does IPV6 which makes IPv6 all the more handy.
In reality I just have a /64 for untrusted wireless, /64 for trusted wireless, /64 for trusted wired network, and /64 for untrusted wired network.
Nice that I can easily get to my OpenGarage widget remotely without having to redirect ports, or depend on some random cloud.
Makes me wonder what level of peoples daily driver sites handle IPv6. Still not a good looking picture going by this: https://www.6connect.com/ipv6/ipv6-progress-report-top-sites... but slowly getting there. Though with Amazon and Twitter not offering them, that may be key pivot points.
Thing is, IPv6 took a while to come about (1) to solve a problem that had in the meantime created many workarounds and alas those workarounds work and still carry on for so many. Hence the return on investing in IPv6 when you have existing infrastructure is outweighed by the costs still and in business - it just works carries more weight than Engineers desires.
I still wonder when it will become the dominant over IPv4, but even those news items saying that xxxx will be the year of ipv6 moved onto IOT and xxxx will be the year of IOT.
But good that HN are onboard, but what factors do others see are for the stagnant uptake on rolling IPv6 out?
(1) https://en.wikipedia.org/wiki/IPv6 "In December 1998, IPv6 became a Draft Standard for the IETF, who subsequently ratified it as an Internet Standard on 14 July 2017"
edit add - formatting and reference