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If this actually works, it's a security hole in both the devices in question and the wifi access point, for allowing a random device on the network to break its connection and block access.

Detecting devices by MAC address and warning about them makes sense, but it should not be possible to block a device without cooperation from the access point, and the description on this site makes it clear that that isn't the case.

They do say that "blocking" access points you aren't the owner of might be illegal.

I guess this is functionally similar to ddos.

They have a mode allegedly capable of disconnecting Glass from its owner's tethered phone WiFi. If you do that to someone wearing Glass, I believe you're no better than the so-called 'Glassholes' you're fighting against.

I wonder if it's possible to use this on someone else's open network? EG, I walk into Starbucks, plug this into the wall, and deauth everyone else's devices?

You could do that easily with mdk3 - Actually from what I've seen this is just mdk3-in-a-box

Cyborg Unplug