We can't say it any better than Owen Thomas: Linspot is an old idea the time for which has passed: Linspot regurgitates the failed model behind Joltage (dead), SOHOWireless (disappeared), and Sputnik (transformed into an enterprise and hotspot software company).
Thomas's post spells out most of the reasons. Let me give three more: locations are likely to be in people's homes who are running network connections which aren't allowed to be shared under the ISP's contract; people don't like to park outside other people's homes to use Wi-Fi very often; and the prices cited on their how it makes money page are dramatically overinflated. Most of the networks outside of T-Mobile's US and most European WISPs charge much, much less. Unlimited Boingo Wireless usage is $21.95 per month and this includes all of its worldwide affiliated networks.
I don't mean to be part of a wave that crushes what could be good software, but to quote Thomas's conclusion: If Nuyens were smart, he wouldn't make this a revenue-splitting service. He'd just sell software licenses at $19.95 a pop, and leave it up to his customers to figure out how to actually make money.