Making a market for "dark Wi-Fi"

Just as AirBnb makes a market for underused bedrooms, and Lyft makes a market for underused passenger seats in cars, BandwidthX seeks to make a market in underused ("dark") Wi-Fi, so that your phone provider can link you up through available Wi-Fi when you are on the move (and thus delay having to add expensive extra capacity). BandwidthX's 'dark Wi-Fi' capacity marketplace is in trials, says CEO