@scottalanmiller said:

We use Hola, which does something similar.

Wait, wasn't there a huge uproar about Hola doing something shady?
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Ah, here we go:
http://www.pcworld.com/article/2928340/ultra-popular-hola-vpn-extension-sold-your-bandwidth-for-use-in-a-botnet-attack.html

Someone even took the time to set this up: http://adios-hola.org/
 
I don't pretend to know everything about the situation, I just remember seeing this and adding them to the list.