Then it should do so. If I connect and I can use the network without paying, that's not my fault.
I honestly can't believe we're even having this conversation. It is theft, period. Not only is it illegal, it's blatantly immoral.
It's not theft. It's not immoral either. Open wlan means exactly that, so where is the sign? You are on HN, so using something like a VPN is not uncommon, regardless of what network you are using.