[friendzis]

Especially in public gathering business, when you are subleasing some part of the attraction (alcohol, wifi) there are provisions in the contracts to ensure the provider is the only one providing the service. That's why it is usually illegal to bring own alcohol to festival. In this case they could argue to have acted in good faith according to the contract. Should the wifi provider/venue operator first block all APs and then accept rebutals that it is for personal use, or attempt investigations if given AP is for sale?

[PhasmaFelis]

Illegal contract provisions are not enforceable. I can sign a contract saying you can jam my wifi, I can sign a contract saying you can kill me and serve me as the main course at the banquet, but you're still not actually allowed to do those things.