I used to play Faery Tale Adventure on Amiga. The anti-piracy was code phrases around the edge of a paper map.

Not UNIX-like, iOS is real UNIX.

While you should probably fix your router, there are some workarounds that can work. If you have your own domain, cloudflare tunnels are really great. Similar option that doesn’t need a domain but requires a VPS or other hosting with a public IP is just a WireGuard tunnel to your service.