It's because it's hard to do right, and securely. With IPv4, it's been around so long that all the secure issues are well understood, and software just expects it to be there.
IPv6 has a bunch of possible security issues, and breaks in all sorts of unknown ways.
It's not impossible to do, but it's a lot harder then just installing some software. As an example, libvirt comes with all sorts of network filters that will prevent IPv4 guests from doing all sorts of bad things (IP spoofing, ARP poisoning, etc). In contrast, it comes with exactly zero similar filters for IPv6.
You need to explicitly ask for this from providers. While you might not get it right away, having the demand there is the only thing that's going to encourage companies to spend time on it.
IPv6 has a bunch of possible security issues, and breaks in all sorts of unknown ways.
It's not impossible to do, but it's a lot harder then just installing some software. As an example, libvirt comes with all sorts of network filters that will prevent IPv4 guests from doing all sorts of bad things (IP spoofing, ARP poisoning, etc). In contrast, it comes with exactly zero similar filters for IPv6.
You need to explicitly ask for this from providers. While you might not get it right away, having the demand there is the only thing that's going to encourage companies to spend time on it.