It would be nice if they broke that chart down by AS numbers, as I suspect much of that is the mobile carriers. Here is some data [1] looks like about 27k AS numbers comprise all of the ipv6 usage. I stand corrected, looks like mostly mobile and Amazon for the US and then the rest is several other countries that are primarily using ipv6.

[1] - https://www.cidr-report.org/v6/as2.0/#Aggs