What a bunch of crap. They salivate at the thought of the implications of this type of technology. This, among a vast many other reasons, are why I never connect to public wifi hotspots. I did a few times when absolutely required before but I will now forego connecting and using data or just going somewhere where I know I have a connection. The average person just connects to anything they can find and I find that awful; they don't know and/or are not made aware of the list of vulnerabilities they are willfully allowing their personal information to be exposed to.
Nice how they also, after finding out the source, attached GitHub to take it down. Can't have the public finding out the shenanigans you are up to!