Assuming you live/operate the network in the US, it is grey, but your future operation of the open-wifi might be made more difficult. Have a look here[1] of th

Assuming you live/operate the network in the US, it is grey, but your future operation of the open-wifi might be made more difficult. Have a look here[1] of the potential actions that can be taken against you and your potential response to those. In the end it will be a matter of how far you and the other party are willing to push this. This will be different of course if it can be demonstrated that you intentionally ran the open-wifi to bamboozle or encourage illegal use. (because you advertized for or boasted about it in an online forum for instance). [1]https://openwireless.org/myths-legal.html https://openwireless.org/myths-legal.html