This does not steal data, it destroys the computer[1,2]. For all I know the device itself is legit, but I didnt try to buy one so I cant attest for the site itself.
[1] https://www.youtube.com/watch?v=_TidRpVWXBE
[2] http://thehackernews.com/2015/10/usb-killer.html
It destroys the USB port. Again, who is going to go to someone's house with a USB drive and try exploring all their crap to find specific files, when you could spend 20s to rip the HDD out and take that so you have unlimited time? It makes no sense.
You obviously didn't read my post in the context of the thread/item*