What price is free? In the case of Windows 10, many argue that it means giving up a little of your privacy, and it seems that AT&T's free Wi-Fi hotspots also come with a hidden payload.
Whilst visiting Dulles Airport, computer scientist Jonathan Mayer noticed that "the web had sprouted ads. Lots of them, in places they didn’t belong".
With time to kill waiting for a flight, Mayer set about investigating where these extra ads were coming from. It didn’t take long for him to discover that the AT&T hotspot he was connected to was the problem. He found that the hotspot was injecting a stylesheet which in turn pulled in advertising. But it didn’t end there...
While AT&T's terms of services do not make explicit reference to ad-injection, Mayer points to one clause which could cover it:
Mayer is a lawyer and is aware that the subject of ad-injection is a "messy one". He says: