It also helps when you connect from mobile networks, as due to various things (including, afaik, licensing shenanigans) there's a huge push for v6 in mobile net

It also helps when you connect from mobile networks, as due to various things (including, afaik, licensing shenanigans) there's a huge push for v6 in mobile networking. Even your v4 traffic is probably going over v6 using 4x6x4 translation.