How do u prevent proxy hacking?

I just started reading up on this. Can competitors really do this to you and is there any tool that will help prevent it?

I'm a bit late, but maybe someone will find this article useful:
http://www.seofaststart.com/blog/google-proxy-hacking

Actually I don't know if proxy hacking is still possible.

Better late then never my friend. Im still having some trouble with this , i will read the article, thank you so much.