I don't see how a judge would proceed with the case. The coffee shop offered free wifi. They "authorized" the public to use their service in that simple act. This was not unauthorized access.
My understanding of FCC regulaions is that ANYTHING broadcast through the air-waves in the USA is fair game. If you want to broadcast TV signals, anyone can receive them. Same with radio of ANY type. If you want to protect those signals, you encode them and require customers to buy your decoder box. In short, if you have the time and money to receive signals broadcast through the air, you’re free to do so - ANY signal