Definitely the best for having believable, dense and bustling cities. While the scenery and nature in most open world games is great, a lot struggle with the cities not being super small and also boring. Where as in the Witcher 3, there is whole story arcs solely in Novigrad and it feels like a place that people would live in.
I think Tailscale also has the option to open certain tailscale IPs to public so if you have some service you’d like to share, you can use the same process but anyone could access it (maybe a small self hosted site)