What’s their excuse?
The same reason so many “business server hosting” companies claim that a 5 year old unpatched version of PHP is “world class”.
Laziness
I think it’s more laziness. If they were greedy they would charge for ipv6.
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.
There’s like 6 more bytes used for an IPv6 address, I think. Their server doesn’t have enough RAM to hold it all.