Wow, the OP asked about places that offer free WiFi and he got a lesson in manners, ethics, and law, all in one.
Its enough to make discussions about speed limits appear tame!
I don't think some folks are listening to the arguments, though. It seems they are bound and determined that they know better than those who have been debating and discussing this issue since radio was first invented.
I wonder if there is any correlation between all the straw men brought into this discussion and the end of Burning Man 2006?
A few issues to be aware of. One is that a router is a computer and to use a wifi signal is to take advantage of that computer and its storage and capabilities. Another is that the frequencies involved are shared - hams take advantage of this to run more power for more range under license with certain restrictions (they often just upload new software to existing commercial routers to do this). A third is that people purchase internet connections and are bound by agreements with the service provider that can impact its proper use.
What I am seeing are a lot of arguments that remind me of the heyday of the CB craze and some of the rationalizations used for operating without a license, with illegal appliances, and with other disregard for the FCC regulations.