Please. I think my views have been a little unclear.
I am not criticising the services offered by these establishments. They are great add-ons. I have used them many times. But they are just that, add-ons. Macdonalds (for example) are not in the business of supplying seating and airconditioned comfort (also overheads) for Free WiFi users. They are in the business of selling burgers. If you choose their burger over that of the rivals because they have WiFi access, the service has been a real winner for them.
And you are quite right about the fact that using pub toilets is exactly the same. I agree 100%. But these overheads need paying. All overheads are costed into the prices of the products. If they aren't, again I have to say, bad business protocol.
Also, please dont confuse what I may have done in the past with right from wrong. If I pop into the local pub to have a quick 'Jimmy' with no intention of using the premises for which they were established, does that automatically make it right now? And I would not argue it to be right if you did it.
I also agree on the fact that WiFi will become 'Add-ons' at places on a wider basis. But I think the word Free is getting a little confused by the more appropriate term, 'Complimentary to patrons'.
But lets get back to the original point. If I left my network unsecured (for whatever reason I chose), and Bob next door decided he wanted to download large files, or worse still have My IP address logged on dodgy sites, I would be a little miffed, and I believe I would have every right to be.