Wifi networks may add popup pages by man in the middeling connections to unsecured sites. However, it’s very uncommon to see an unsecured site and people therefore won’t see the popup which grants them access after agreeing to the terms of use of the network.
Numeric .xyz domains only cost $1 a year. They’re not great for things like mail because they’re often used by spammers (probably because of the price), but it’s great for cheap signed DNS hostnames.
I point it to the server on my local network and use Wireguard to connect myself.