I'd assume a lot of this is because of mobile devices of some type. Getting legacy network operators like cable providers to supply IPv6 has been hell.
In Asia they've implemented v6 everywhere pretty much because their v4 allocation is woefully insufficient. APNIC has like 4 billion people in it but less IP space than ARIN, with a population of less than 500 million.
If the ISP is IPv6-first, you bet that their customers are using it in their home WiFi.
In my experience it's actually the large enterprises that are having issues.