I have only just realized how serious this problem is getting. I didn't know this was going on until my friend recently got banned from adsense.
The growing trend is that other proxy owners will eliminate competition by taking another persons publisher code and using their ads on proxified pages which will get the other person banned.
I think that this is just a disgusting way to try and beat other proxy owners.
Please comment if you have known that this was going on and if this may have happened to you.