If you can, power stuff off and check if that web page is still available. Start with any Windows machines. It could be a virtual machine running inside of something else though.
Edit: here’s how to disable that web server https://superuser.com/a/1377078 . I’d do that on any Windows machines as well.
https://jasminewarga.com/a-rovers-story is the extended version of this.
I’m some states you can register to vote at the DMV when doing some other DMV things. Not sure why they’d give this person a hard time though.
It depends what you count as a casino. I grew up in Las Vegas and there’s slot machines in most grocery stores and gas stations. Also the airport has slot machines. If that counts as a casino then there’s hundreds if not thousands.
I’d go around unplugging anything that might be connected to the network, like game consoles, smart TV, etc. It’s unlikely, but maybe something has copied that same screen to throw you off.