I was on a ferry ship from Italy to Greece where they had paid sattelite Internet via WiFi. The WiFi AP was at first a captive portal. You could buy Internet access with cash at the reception or you could pay online. For that they had to enable access to stripe.com. But stripe uses fastly CDN, so they enabled one specific fastly endpoint that stripe uses. You had direct IP traffic to this specific IP address. reddit also uses fastly CDN. So with a /etc/hosts hack I could load reddit pages for free. Not images though, as they are hosted by imgur.

I assume one could also create a tunnel over reddit chat connect to the Internet, but I never did that.

By default, reddit did not work though, as their fastly CDN endpoint is different from stripe's, also the stripe's endpoint did not correctly sign TLS for reddit.com. But setting a Host header of old.reddit.com on that fastly IP successfully downloaded the page.

When I still had phone network by the coast, I set up iodine IP over DNS tunnel, but it did not work, even though DNS requests worked on that WiFi. Maybe they had some sort of protection specifically for iodine.