UK StubHub - https://www.stubhub.co.uk/nfl-london-2023-jacksonville-jaguars-vs-buffalo-bills-tickets-tottenham-hotspur-stadium-8-10-2023/event/105905006/
Basically legal ticket-touting but while it's a very un-regulated business stuff like this will happen.
Nope, never been to that pub. I can't say I'll be rushing there either. Not a fan of organised fun. I'm sure it'll be great for others though.