How does Fan Duel know I’m using Tailscale ?

Home is in NC where I’m running a WD11 mini PC with Tailscale running as an exit node. Online gambling is legal in NC.

Currently traveling in Texas where online gambling is illegal. I’m carrying my WD 11 laptop with Tailscale running.

If I ask via Google what my IP is and what is my current location, my laptop shows I’m in NC.

If I try to access Fan DueI website, I get a message that gambling is not allowed in my current location.

I’m confused, how does FD know I’m not in NC?

What do I need to setup so I can make a $5 bet while I’m traveling?