You get what you pay for. Non-revenue generating services are setup and maintained as cheaply as possible. They're not going to buy extra IT labor to test IPv6.

You get what you pay for. Non-revenue generating services are setup and maintained as cheaply as possible. They're not going to buy extra IT labor to test IPv6. In fact they go in the opposite direction by locking down ports to just ports 53, 80, and 443. Other ports are blocked because non-web traffic includes bandwidth hogs like BitTorrent & Zoom, spam over port 25, and copyright infringement letter generating activities. The most annoying networks even force DNS and HTTP through a proxy leaving TCP 443 as the sole pinhole to the Internet.