Adding IPv6 would cost them money. Probably a relatively small amount of money, but still money. They get nothing from that investment. As long as they have IPv4 addresses to assign to their customers, there's basically no demand for IPv6 addresses. NAT and UPnP work fine for just about everyone. I think the only way we see serious IPv6 adoption in North America and Europe is government mandates.
It's not working fine for me! 
I need a static address and they quoted me $200/mo for an IPv4 one.
Does ddns or ngrok type solutions not work?
DDNS doesn't work behind CGNAT. Never heard of ngrok; google says it might work. I'm trying to do something with WireGuard.
they're using cgnat and turning off ipv6? what the hell..
INORITE! 
Cloudflare tunnel (aka a reverse proxy, like ngrok) will also likely work for your mystery project, and it’s free. VPN is more secure, but as always, it's a trade-off between the security of a vpn and the convinence of a reverse proxy that's available on the open internet.
A reverse proxy like nginx?
Basically, I want to move files between my NAS (behind CGNAT) and webserver and rsync isn't cutting it. I think WireGuard will be best, then I can use my existing NFS and Kerberos infrastructure.
Do you need a static IP or could you get away with using dynamic DNS like duckdns? I think wireguard allows you to use a hostname instead of IP address. The wireguard peers would have static private IPs in the VPN address space. I had a much simpler setup than you, but this is what I was doing before tailscale.
A dynamic IP would work; I just need an IP that is unique to my router and isn't shared by a dozen other households---I don't know what the term for that is.
There is a way to make it work with WireGuard using something called MASQUERADE, I'm learning.
Mine told me I can have gigabit fiber, or static IP on 50mb/s copper, but not both, because something something piracy.
Just torrent a bunch and I think they give you a static address so that they can potentially suenyou later.
My IP hasn't changed in years.
Mine told me I can have gigabit fiber, or static IP on 50mb/s copper, but not both, because something something piracy.
Does ddns or ngrok type solutions not work?
Damn that's crazy. My ISP only charges me £4/mo for static ipv4 addresses.
Mine told me I can have gigabit fiber, or static IP on 50mb/s copper, but not both, because something something piracy.
There's like 6 more bytes used for an IPv6 address, I think. Their server doesn't have enough RAM to hold it all.
6? try 12. They're going to have to spring for a Pentium 2.
Makes sense.
literally just too lazy, nobody is asking for it and at a small or medium scale probably no cost benefit to them besides future readiness
I guess I should ask for it so they know there is demand.
The same reason so many "business server hosting" companies claim that a 5 year old unpatched version of PHP is "world class".
Laziness
Greed
I think it's more laziness. If they were greedy they would charge for ipv6.
its more the lets not spend money because nobody will pay for it kinda greed.
It could be equipment related?
I have municipal fiber and used to have ipv6 before they came out and swapped out my little modem for this fiber to ethernet converter box. Now I get no ipv6 anymore
I think all networking equipment built within the past twenty-five years has both IPv4 and IPv6 built-in.
just sayin, it could be a configuration issue.. like in my case.. im sure someone has to flip a bit somewhere but talking to T1 support is useless and i didn't care enough to press the issue
Yeah same.
Those who do and use Winblows, don't ignore your patches. Especially if using any kind of public wifi, definitely if you port forward for any reason or have any P2P software running that might've done UPnP... Just a mess.
The same reason so many "business server hosting" companies claim that a 5 year old unpatched version of PHP is "world class".
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