[archi42]

The reverse proxy is a nice idea. Any reason not to offer a "get a TCP port redirected to you" in a similar fashion? E.g. I run a VPN server for my mobile clients (wireguard), which sometimes only have IPv4 connectivity (e.g. office wifi). A 9 Euro node with an IPv6 and one random-but-static IPv4 TCP port would be enough for that, while the pure IPv6 node sadly wouldn't work for that.

You could put it in tiers: S gets 1 port, M 4, L 16, XL 64,...; or something like "get a chunk of 50 ports for 1 Euro/y extra"; or combination of both.

[canvayio]

Yup, that's next on my list. I'm going to roll out larger fully routed IPv6 subnets first, then follow with port forwarding later