> it's even more likely in other countries.

The US is ahead of most other countries with ipv6 adoption.

Here in Australia I email my ISP once a year or so asking about ipv6 support. They have "no plans at this stage". And have had no plans for years.

You can see the per-country IPv6 support here:

https://stats.labs.apnic.net/ipv6

Apparently here in Australia (like much of the rest of the world) we still only have ~25% of our population on ipv6 networks. Africa is almost entirely dark.

Weirdly India is the world leader here, with 73% of devices being ipv6 capable.