My ISP in a small rural town supported IPv6. I have a few personal projects that only have a public v6 address because I don't want to pay AWS for an v4 address.

It worked fine for a year and a half after I moved in, then they did some work and suddenly no IPv6. At least I could enable 6to4 on my router, but that has intermittent issues.

As someone who wishes IPv4 would just die, I wish I had options to push back on such nuisances.