I had an image of what this was before I clicked the link but I was disappointed. Here's my idea: No hardware required. You share your existing connection (mobile or not). It's public except the user needs to give you some sort of token that you can't forge and shows how much time they used. In turn you can use those tokens to get time on other people's wifi. Basically "pay it forward" with a little bit of abuse prev…
I was thinking about this too, but there is one problem with a purely pay-it-forward type model - there is no 'debt'. That is, how does one earn karma in order to buy uptime? You can 'sell' your connection to someone else, but where do they get their karma from? Part of the solution might be to provide 'seed' karma to new users, but then you inevitably will have users who don't spend the karma they gain and so become…
This doesn't seem like a problem to me. A karma sink is a connectivity source. Surely we're trying to optimize for the latter quantity? If it makes you feel bad you can give away prizes or something.